I have been using Imageworks for my decals, good quality and I know he has graphics up to 91 at least, good to deal with and has made one for the red 88 from template provided. Have seen some of the ones on ebay and not a patch on his to be honest. Think his website is called bike stickers .com, Graham is the guy I talk to, worth asking if he does what you need.
As @CYBER-NINJA said, they are compatible to an extent, you do need the seat tank.
From a collectors point of view, the bike would be worth more as an R.
If you like the rear tail light then maybe I suggest using something like the Acerbis tail light. That would tidy the rear end up nicely. You could mount it to a HPires rear fender.
You could try something called Modelstrip. Available from many model shops, it strips paint off plastic models without damaging the plastic. Obviously test a small area first. Brake fluid will whiten the plastic. Bear in mind they were likely sprayed because they were worn out.
As someone else said, it would likely be cheaper and better just to buy new. I bought a new rear fender for £20 from Fowlers. Cheap as chips.
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