I have a spin on conversion from Randakks Cycle Shack that I used on my GL1000 and held onto when I sold it a couple years ago. Right now it's on the '77 550 engine in my roller project, but I may swap it over to my recently acquired 750.
I never had any issues with the filter and it made oil changes that much easier. I use a Bosch filter (3330), but there are many others including: WIX 51348, Fram 2951, NAPA 1348. K&N KN-174C to name a few.