On the passenger side of the block next to the distributor. Screws into the block and yes great source for an oil leak. Fairly easy to replace and can be sourced at most places.
89 2.5 TBI, 4" RC lift, 1" Booms, SYE, Adams Driveshafts front and rear, Ford 8.8 with 4:88s, BFG 33X12.50X15, and a ton of other stuff.
AF Jeep Club Tail Number 184