I also use WIX filters and here are a few longer filter part numbers. Since it's an air cooled engine the more oil the better for cooling.
Kawasaki 49065-7007
Wix 57035 - 2.3" long - This is the stock replacement size.
Wix 51056 - 2.7" long
Wix 51348 - 3.4" Long
Wix 51516 - 4.8" Long - Also Motorcraft FL400A
I use Mobil 1 10W-30 with the larger Wix 51516 filter after swapping the factory stuff out at 20 hours.
Bigger filter sticks out further but there is plenty of room on my Raptor.
Currently at 125 hours and 2 1/2 years of service.
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