Bolt, M8-45 Exhaust Manifold for 90~95 ZR-1 LT5. Unit quantity is one(1) bolt, sold by the unit only.  Does not include the spacer or retainer push-ring (see image below) which is required for this bolt to install the exhaust manifold/header properly. 

NOTE: This is a NEW, GM OEM part. 

Confusing to many ZR-1 owners & mechanics, is the "missing" bolts for the exhaust manifolds.  The fact is, they aren't missing as they were deliberately not installed by GM.  The absence of bolts in the manifold hole apparently doesn't affect exhaust sealing as the only bolt changes were made during 6 years of production was the elimination of the "center stud" on the 90~92 models. Bolts were added to the manifold on both holes adjacent to the stud slot for the 93~95 models.

It is however, nice to know that ALL of the bolt holes in the manifold have corresponding drilled & tapped holes.  This is especially nice when aftermarket headers are installed. 

 1990~92 EXHAUST BOLT PLACEMENT SCHEMATIC