'Are you refering to shooting HIE in medium format?'
I should have been clearer when I referred to an M7. Though I have a Mamiya 7, and sometimes use it with Maco 820 (there's a test shot in my gallery), in this case I was referring to the 'other M7': a Leica M7.
Though I've never used it, you can get Kodak Aerographic IR film cut from 70 mm and respooled to 120 from www.davidromano.com
I've never purchased film from David but I've gotten good reports from a couple of close friends about his rewinds, so I think you can purchase from him with confidence.