#1. "RE: Oil Filter for my '68 Bonneville?" In response to Reply # 0
First and formost it wil be in the return line to the oil tank.
A commando filter is popular as is a MAP filter.
Lots of opinions on the subject and the only right answer is the one you are willing to pay for and use.
I use the norton filter on my BSA's mainly because it is used on my nortons and ducati's.
#2. "RE: Oil Filter for my '68 Bonneville?" In response to Reply # 0
I have used one of the Norton ones on mine, fits under the swing arm pivot so is dead easy to get to. It just plumbs into the return line from the engine.
Filters are same as Citroen 2CV cars (hence the smaller thread used on these filters) so are cheap and easy to get too. I made a bracket for mine from from a bit of stainless plate and that then clamps to the frame tube with a car type exhaust clamp. There are kits you can buy that do the same job. Well worth doing as it also acts as an oil cooler and gives a bit more oil capacity to the system. Could send you a photo if you want to try making one.