Ive looked at both my mc18 r2j's, all your parts are from a 18 r2j,my frames have a sticker saying mc 18 and the frame numbers stamped in the headstock start mc18-,whats yours say?forget the sticker as you can change them.Show me a photo of were the top fairing mounts as the 18 has a different mounting point welded to the frame from the 16.Looks like you top end has been rebuilt and the rear shock looks like new and the carbs.