Paul,
A minor chord in the roman numeral system is lower case. So in the key of C, "A minor" would be iv. I can't recall now what dominant and major 7th are. I'll take a guess:
V7 is G 7 (dominant).
IM7 is C major 7th.
ii7 is D minor 7.
iv7 is A minor 7.
Starkeeper