On the other hand, my D100 has been intermixed with the body caps from at least six other Nikon (D)SLRs with no ill effects. And that includes third-party knockoffs. My advice: don't worry about it. Use whatever body cap is available. (I suspect that the special ones that are designed for the front of Nikon TCs are a different matter; I've never tried them on a camera.)
_____ Brian... a bicoastal Nikonian and Team Member
My gallery is online. Comments and critique welcomed any time!