Thought I would try this one. Picked it up at the shop today, didn't realize it was for the Gen 4. I can get to fit on my XM, but you have to kind of force it down and it touches the back of the tank. It would probably work ok, but I think I'm going to bring it back and go a different route. I see in the catalog they recommend the LinQ shim kit, which adds another $100 to the cost. Figured I would post this in case anyone was eyeballing one.