Bolt, Oil Filter Adapter Housing, for 90~95 ZR-1 LT5. Sold individually. One (1) bolt is required per engine. 

There are three(3) different length M8 bolts that attach the Oil Filter Adapter to the engine.  The GM parts manual shows only two lengths, 35mm  & 45mm lengths.  The 35 is on the very bottom, 45 is outboard used with the wire loom tab & washer.  The 40 goes in the remaining inboard position. 

NOTE: This is a USED, GM OEM part.