Leaky oil filter housing

I think I have a leak in the oil filter housing on my 93 CV. I purchased a Haynes manual, but it does not cover the oil filter housing. Does anyone know if there is anything out of the ordinary to replace the gasket, or is it pretty straight forward? No oil cooler.

It is a straight forward job. It is just tight getting to it. Good luck

Looks like the radiator hose runs through the oil filter housing, do I need to drain the coolant before I remove the housing??