I highly recomend the BC oilfilter adapter on the O320!
I have one installed on my PA12 and my neighbor has one on his 18
I have now 48 hours on the oil and it looks as clean as new! The installation took about an Hour and with the cooler mounted on the rear baffle I didn't even have to change hoses just redirect the connectors!
The vernatherm mounts right in the housing (CNC's aluminum-no remote mount or extra lines to connect/ leak or burn up!
The unit can be spaced back off the accesory case if desired and can use either long or short filters if desired. check out bills web site for details:www.bandcspecialty.com
I have pictures of the installation in the photo gallery!
PS: Bill is a great advocate for GA and is a great guy to work with