

Before you ever consider using an aftermarket filter on your BMW motorcycle, please read this article: Oil Filter Study
For what it's worth, I have several BMW branded filter, in the BMW box, and they all appear to be made by Champion.
Before you ever consider using a Fram filter, read this email from an Allied Signals production engineer.
Here's an interesting review of filters to fit one particular model of Suzuki, by Mark Lawrence.
Here's a good article about the way filters work, by Mark Lawrence.
Here's a extensive cross reference of oil filers for many brands of motorcycles, by Mark Lawrence.
Here's a recap of oil filter tests done by a Finnish car magazine. Note that the article was published in 1995, so the results might not be up to date.
By the way, I spent many hours researching oil filter aricles, and more than 50% of them say to avoid Fram filters.
A special wrench is needed to remove many BMW oil filters. Aside from the BMW item, several other manufacturers make similar wrenches. Lisle part #547660, for about $8, is available at some auto parts stores. But any 76mm X 14 flute wrench should work.
If you have an interesting source for parts, contact the webmaster at tom@wade.name
Sorry, but Rome wasn't built in a day. Check back later.