Decals for the Interstate have become a challenge. I found a set for the 82 interstate but black only.
The closest I can find is a decal set for the 83 Aspencade in wineberry red. I found them on the KZ900 site. I think they will work on the interstate. The site does say they recommend protecting them with a clear coat. I haven't had much luck with emblems either although I do have all of the originals. A couple are beat up a little but I think I can spruce them up. Everything is off the bike now except the fairing. That doesn't look too bad. Rear fender is pristine so I'll probably leave that alone unless the color of the new paint doesn't match. I don't think I'll replace all the warning stickers. Just don't like the look of them and I won't be "showing" the bike.
I am going to sand all the parts and fill a few scratches, fix a small dent in the tank cover door, prime, follow with a metallic silver base coat, spray on the wineberry candy (that's the hard part) apply decals (might be another hard part - I have no experience applying decals on anything other than models) and finish with 4 or 5 coats of clear. I'll post a few pics along the way in case anyone is interested in the process. Step one is lots of close-up pics so I have a record of how the decals are applied now.