@johnevansIf it helps (!!) I was at Maine Road in September 1971 when we beat came from behind twice to beat Wolves in the League Cup 4-3. We were first 2-0 down after 20mins or so, then 3-1 down with 10mins to go, before Colin Bell scored a couple and Franny Lee scored a penalty late on for us to win it..
Cheers bud, that must be the one, for all these years I remembered it as 3-2. I was 13.