It seems to be a common problem and we had to rig up one of mine to make it work. I would suggest getting them.
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if the tension cables are bad i have a set off a frame im about to junk. theyre not pretty but they work.
btw get the 3m 80110 glue that robbins reccommends its worth the $12. havent tried any other stuff but when i took the old top off to send back to robbins i was worried about tearing the canvas before that stuff let go.
Wait for some warmer weather if you DIY....will make things much easier.
Yes, a pop rivet gun is required. $7 - http://www.homedepot.com/h_d1/N-5yc1...1#.UO2a3W88CSo
I didn't use glue and reused the tension cables.
I was a "really good kid" in HS, and I drove the snot outta my parents 1990 Supercharged T-bird. Be careful!