ive just fitted new big ends and main bearings that really leaves the oil pump,oil pressure goes up an down when the car is ticking over,only registers about 20 on the gauge when upto tempI believe Wins Int’l has new old stock oil pumps available. But, I’d be surprised if that’s a problem. They’re normally bomb proof.
Which part are you actually after? the oil filter on a TC is a spin on type which is replaced as a unit as part of the service schedule? it mounts directly on the back of the oil pump housing?
I think there was a change in relief valve mechanism, in about 1966. Perhaps have has the old type that were not reliable. What year is the car?As mentioned, the moving bits are available new and that should be all you need.
Another thing to check is that the relief valve is OK, which would tend to give low pressure if it were stuck or the spring had broken.
Yours
Vern