This 4 Inch riser for Crusader applications can be identified by being held on by two different length studs.
The 8 inch riser is held on with 4 equal length studs that have copper washers on them. The copper washers and nuts should be replaced upon removal.
Replaces: Crusader # 97772; Osco# 7772; Sierra # 18-1927; Mallory # 9-40401
Barr Manifolds and Risers come with a 3-year limited warranty (PDF)!