I bought one from California Car Cover. They have a pattern for a 66 AC Cobra and you can get it in several different materials. This is the "Plushweave":
We've taken our 100% cotton cover and added a flannel underlining for superior paint pampering luxury. This ultra dense fabric blocks UV rays and cushions against scratches and incidental vehicle contact. Plushweave is treated with 3MTM ScotchgardTM for water repellency. It is designed mainly for indoor use, but can be used outdoors on a limited basis
Got mine from Tony Branda www.cobranda.com ,his is actually made for a lower rollbar ,but still fits an FFR nice and because of the taller rollbar it makes for a nice tent effect so water cant puddle.It also has a flannel liner.I think I payed about $140.Look at his site under miscellanious accesseries.
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