DIYstu's wipes are awesome. Fierostore also sells a slightly "cheaper" design of wipes.
Corvette units may work well but I'm going to support the guys that specialize in Fieros as that is a dwindling market and I would want anyone that's interested to be able to get into the hobby. A lot of folks aren't terribly well inclined to make parts from scratch. Good to hear about options, though.
Steve, I did a write up on making these quite a while back. I sold around 30 sets of the rubber parts and made the ones that were on my silver 86 notchie. It is five pages long, but lots of information there.