ok im stuck i have a gem-250 2 gem-400's a older one and a newer one plus a older nema glass lm fixture also and a lm-400 i have a old revere and a few ov-20's but there remote balast type and one big ov-25 !! so im like man this is hard lol 

Does the ballast have a cap (CWA type) ? If no cap (HX type), I think it would be cool in a NEMA type fixture. If has cap, might go well into GE M250. Just an idea.

yeah i poped it in the 1962 glass line materials nema ill post  apic in a min