cats cats cats
I have not seen them in anything smaller then 650s
now i work on all kinds of cats BH dozer's and so on don't ask me the engine # i have no clue. But most cat moters i deal with drive hydraulic pumps. Some would be the right size 2 fit in 550 and smaller
here are some links from works web site on-road moters can't find off road page set up the same
http://ohe.cat.com/cda/layout?m=85161&x=7