I've been searching also for a vinyl copy with "You're The Boy" as the B side. I've never seen a copy even on the promo releases. The Kama Sutra singles CD seems to indicate that the B side did actually exist for the first two months or so after the KS 203 release. Artie Ripp might know the answer if anyone can contact him.
The song (You're The Boy) is listed in MGM's master book from 1972 as master no: 65-UT-0015...weather or not it was issued this way is probably up to conjecture....(then again a copy might pop-up somewhere along the years)....John