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Mustang (1979-1993) FOX BODY

Removable Hardtop Fits all 1979-1993 Mustangs

FOX BODY mustang-convertible-01


    coupe style
      $ TBA .00


convertible style
 $ TBA .00


We are currently working on a REMOVABLE HARDTOP for the Mustang Fox body 1979- 1993. This exciting new Hardtop will fit all Fox Body convertibles without any modifications to the car and is very easy to install by the average DYI.  The design simulates a lower profile of the factory OEM style coupe. Smooth Line is offering two different versions using the same profile.

The “Convertible” style uses a convertible size rear window, and incorporates the use of the small factory roll up quarter windows. 

The “Coupe” style uses a larger rear window and large fixed quarter windows, similar to the coupe. 

All Hardtops are complete with all hardware, rubber seals, windows, etc. Nothing extra to purchase.

Due to Covid we have had to put a hold on development of this product

We are now accepting names for production run. Once the pre-production run of 20 units are sold, pricing will increase. 

If you are serious, don’t miss this bargain!    Thanks for your interest.

                                    AS PHOTOS BECOME AVAILABLE THEY WILL BE PUBLISHED


#1 Performance Option

The #1 MUSTANG performance option is designed for action. Change your wind-in-the-hair boulevard cruiser into a super coupe in minutes. Simply lower the convertible top in the normal position (the convertible top is not removed) and latch the Hardtop in place. Now you can experience the full potential of your Mustang on the street, strip or track.

Enjoyable in Any Season

When the weather is fair and the top is down, nothing beats the joy of driving a convertible! If the weather is too hot, too cold, too wet, or if you are on long drive on the freeway, you just can't beat a Smooth Line Hardtop. Now you can have the best of both worlds! Driving can be enjoyable in any season with the quiet comfort and security from the Smooth Line Hardtop. A perfect replacement for that leaky convertible top. Adding a Smooth Line Hardtop is the best styling and practical improvement that can be made to your Mustang convertible. 


Is your convertible top getting ragged, tired looking, leaking, and ruining the appearance of your car? Or worse yet, having electrical, hydraulic  problems?  It is time for the Smooth Line solution, the ULTIMATE REPLACEMENT CONVERTIBLE TOP. Eliminate the hassles and bring back the pride and joy of ownership of your ride! 

Attachment is very simple, does not require any modification to your Mustang and fits all 1979-1993 convertibles. Simply lower the convertible top in the normal position and attach the hardtop using the easy to turn tightening knobs. Very easy and requires only minutes No tools are required.

The Smooth Line Hardtop only weighs approximately 40 pounds and is easy to handle. A specially designed Smooth Line Hardtop Carrier and hoists are available to safely store it when not in use. Find out more here 

All Smooth Line Hardtops are custom made to order. Included at no extra cost is heavy duty packaging for world wide shipping. North American shipments are via truck and overseas are via air or ocean. Freight cost is additional. Ask for our special discounted freight quotation.

Read about Smooth Line hardtops in Mustang Enthusiast.

Features (included in base price)


  • High strength, light weight, precision molded, hand laid, oven cured fiberglass composite.

  • Approximately 40 lbs.. Easy to lift on and off.

  • Premium automotive grade materials

  • Exterior rain guards.

Exterior Finish (Base Model)

  • Grey sandable gel coat designed for easy finishing using normal body shop technics.

  • Many exterior  upgrade options available.


Interior (Base Model)

  • The interior is fully upholstered with a thick charcoal grey color automotive headliner. 

  • Improved sound and insulating properties compared to the convertible top. Upgrade options available


Rear Window (Base Model)

  • Clear Plexiglas ( 1/8" thick- same as glass)

  • Rear Window Flush mount  

  • This light weight impact resistant acrylic material will not discolor or become foggy and with reasonable care will last for years.

  • Upgradable to tinted Plexiglas.


Attachment Hardware

  • The front and rear mounting system is custom designed for the Mustang.

  • The front incorporates the exclusive “Sure Fit” design for an easy and secure installation.

  • All metal components are made of high strength corrosion resistant steel and are designed to provide

      a simple, secure, and professional fitting Hardtop.

  • This application does not require any modification to the vehicle and is easy to install.

  • Once installed the Hardtop can be easily removed or reattached in minutes without any tools.


Weather Seals

  • Custom extruded rubber moldings are matched to the windshield, rear deck and side window to ensure a weather tight seal.

  • These OEM quality materials are resistant to sunlight aging, water absorption, and ozone.

Illustrated installation instructions

  • 12 month warranty


All Smooth Line Hardtops are complete. Nothing else to buy!
Installation Instructions


Smooth Line Hardtops require no modification to your car  The convertible top does not need to be removed. It stays with the car in the down position when the Hardtop is mounted. Please see installation instructions for details.

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