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Where could I get some "corvette" caliper decals in black/white letters?
Correct me if I'm wrong here, but I think the OP is looking to simply cover the lettering not paint the whole caliper.
If so, you can purchase a paint pen and just paint the lettering. Will adhere to caliper better and longer than a decal and if you don't like it, sand it off or choose a new color. Most craft stores will have these or get auto touch up paint.