Mike, I don't know the answer with certainty, but recall baffle interferance is the issue that would occur with a mismatch. Did you install the new style pump and encounter clearance issues with the baffles of the oil pan?
For what its work, the drain plug on my oil pan is big, i.e. takes a 22mm wrench to remove and I have the old style pump and pickup.
Ricardo Maestas - Bio Page
1999 LX 470
- 1971 FJ-40