I知 the guy who said the Wix WL7426. I searched for a long time and cross referenced the engines to another vehicle (in Korea). I first used the Wix 51516, but felt it was too small (less filtering material). I致e been happily using the WL7426 without issue on my XR4140HC. Just buy a few of them up front to save the hassle and extra shipping costs.
The WIX WL7426 did not fit my 2019 XR4150 HST. At first I thought I was just having trouble threading it on, or the one was damaged or something, so tried a second one, same result. The filter post, (or whatever you call it) looks to be a different diameter. Threaded the original back on no problem. If the WL7426 doesn't work, I guess that means the 51516 won't work as well? Anyone have a different filter number for a XR5150??