These glasses were available from an offer shown in the Nintendo Fun Club News #4 – Winter 1987, predating even Nintendo Power. It required you to send in a coupon, a UPC from the Rad Racer box as well as a couple of tips on playing Rad Racer.
I can’t imagine that many of these were made initially. Given the offer was eventually discontinued, I can’t imagine many were actually given away. I know that as a kid, I wouldn’t have wanted to destroy my box for a pair of crappy 3D glasses. Even less have no doubt survived the twenty years since.
Bottom line is that I think this makes for an extremely rare item, in excellent condition.