The oil filter may attach to side of block rather than be on an angled mount/take off plate as per rhd cars.
ive got an angled take off on my oil filter, the engines not been in the car for 3 years but I was told it was to miss the steering column. I’ll see if I can find it in
Mines off a n42 block, 280zx. Just checked my l26 motor it doesn’t have oneI was just eluding to I don’t think it’s a standard figment on a RHD S30. It may well be an option...