I got the whole nine yards mount, manifold (not needed), air line, Chuck and compressor. I went for it. It was a kit and it was cheaper to buy it all than it was to piece what I needed.
I was going to squeeze it under the brake booster, but I didn't want to get to the point where I couldn't do it, and then have to wait for the mount to show up. I may still try, and put it under the brake booster, but I wanted the mount on hand in case it proves to be difficult. I did see somewhere that
@tomtaylz originally had it under his booster, but then he moved it, so I wanted to have the mount on hand just in case.