You can modify the bracket and unscrew the 2 little black things and a CAT will screw right on,I can't find the link but my son did it w/ his AD150 and works fine.
I have been going 10k on mine, but i filter it prior to filling the tank and i also have an airdog now. Its funny how different CAT dealerships charge. Its $14.21 a filter here in ND
Most the customers buying them from us have told us that they are doing 10k miles. We just got the 1R-0751 for the Air Dog in so I do not have any feedback on that filter yet.
Does not having the water seperator concern anyone else? I have the adaptor and filter sitting on work bench but I dont like that part. I know donalson makes a filter with water seperator but I like how easy and cheap the cat filter is.