Overall length is 4"

Fits 2 or 4 bolt pumps.

Pilot 1.792"

Mount to engine 2.5" side to side and 3.6" corner to corner   3/8" bolt holes

Mount to pump 2 bolt   2-7/8" center to center 

Mount to pump 4 bolt   2" side to side  and 2.825" corner to corner  3/8" bolt holes

Made of ductile iron