[A26B]

Roger,
If you have any difficulty finding the bolts you are looking for, we have a large inventory of LT5 OEM bolts.

Throttle Quadrant Cover Screw
http://www.jerrysgaskets.com/screw-a...ew-90-95-6-5b/

Exhaust Manifold Bolts

The actual specification for the bolt is inclusive of the spacer you noted. I have always thought the spacer is to make getting a socket on the bolt head easier where the header tube is close to the hole. The M8x1.25 bolt can be sized to 25mm length if you use a socket head cap screw (allen head) of a reduced hex head header bolt. Not all exhaust manifold bolt holes actually had bolts installed at the factory, even though the holes are tapped. I think only 5 or 6 per side actually had bolts installed.