Or you can go to a salvage yard, get a pair in the color you like from a car that has them in the look you want (I got mine from a '92 Chrysler LeBaron convertible) along with all the mounting hardware and trim covers, and they usually get $10 per side (I got both of mine with all the hardware and trim for about $10).
Mine retracted great until I added the tonneau to the car and leave the back up and the front flopped behind the seats - the material interferes with the belts retraction so I guess I'll have to do something about it.
Drive your Speedster over to the salvage yard and let them look it over and they may even GIVE the belts to you!