Thor:
I too looked into a FRAM oil filter for my Yanmar 3JH2e and found one. Then I was instructed by the Mack Boring Diesel Class instructor to NOT DO THIS. Yes, it will fit, yes it matches, but it is a very bad idea. At least with the oil filter. I did it once, then after speaking to Mack Boring, I switched back to Yanmar Oil filters. They said something about the o-ring and interior filtereing is not as good with a FRAM. Yanmar Oil filters coast about $10 and we use about 3-4 a year, so will stay with OEM filters.
On the Fan Belts, I use teh GATES GREEN STRIPE, these are easily available at auto stores.
Hayden