1985 was the first year the CMX250C Rebel was available. If you have an '82 CM250C then that is the precursor to the first generation of Rebels. There were all sorts of variants -- especially North American and European market models. '82 &'84 models were chain driven, but the '83 models were belt driven. Corrosion was a real issue with these models and the front disc brake was subject to seizing because of this. I don't know what your chances are to replace the air cleaner with an original with the exception of finding a parts bike out there somewhere. Best of Luck, and welcome to you and your lady.
1986 Honda Rebel 250cc