This cartridge seems to be a perrenial favorite on VA. I'd really like to compare it to a 103r, as some have on VA, just to see what all of the fuss is about. But I have been so happy with the 103r that I figured why spend the $$$$. If I do break down and buy a new cartridge, it would probably be a ZYX. But there are other things that are in the works first.
I don't think you would need a spacer, but I'm not really sure. Why do you think you need one?