From my previous research for a project of mine, I suggest investigating Viair compressors.
http://www.viaircorp.com/OffRoad/compressors.html
As far as I can tell some of their smaller models should fit within the maximum specifications given in <R75>
At least for the higher models I looked at for my project, google found many places to buy these compressors, and I'd guess the lower spec'd ones shouldn't be too hard to find either, but I haven't looked.