If you choose to install an OEM oil cooler, you can't use the oil filter cover that has the thermostatic bybass valve, it won't clear a stock right header pipe on an R65.
Instead use the oil filter cover from a mid to late '90's R100 bike, the filter cover doesn't have the bypass valve.
As mentioned the hollow tube that the oil filter goes over needs to be changed to a longer one, and you need to start using the 'long hinged' oil filter.
I believe I priced it out piecemeal, and you can save some cash if you don't buy the OEM cooler kit, the oil filter cover/thermostatic bypass valve, is the most expensive part in the kit.