Lot of 36 black oxide finish studs and 40 black oxide finish nuts.  Sized m8 X 1.25, OAL (over all length) measures 2-1/8" (54mm).  Came unmarked in large OE parts lot with other OEM NOS Ford & GM parts.  Might have been for Ford modular 4.6L engines.

Shops free via small USPS flat rate box. You pay for any delivery upgrades.