Scott and AJ,
AJ - I just went and looked at mine and you're right, it's VERY snug. Guess I had a lot of patience....
It just occurred to me that there might be another issue here. It might depend on which "single stage filter" we're talking about. There were two types depending on serial number of the tractor. One was a plastic filter with a female connection that went over a "pipe" that was inserted in the rubber hose. The other single stage filter (later serial numbers) was a metal canister similar to the two stage but with a single removable paper filter. The one I changed from was the early style plastic filter. I removed the pipe and forced the existing hose onto the new dual stage filter.
All three of the hoses have different PNs on JDparts. It appears that none are available from JD.