went to put my head for the frst back together and theres a nut missing from the inlet manifold..left hand side hole looking from behind the inlet...it goes in a deep hole that the stud doesnt stick out of.

heres my problem,like a twat i chucked all the bolts from the engine in the same box and i cant find the one that goes in that hole...can anyone tell me what it looks like so i know what im looking for