As an affectionate nod to older jaguar engines I made my own cam cover bolts.
I started with a bolt (left)
Bolt with head cut off
Small acorn nut on bolt. although the nut threads right on the bolt it looked too wimpy
Larger Acorn nut I ended up using is attached to bolt with high temp JB Weld
Everything is stainless steel although the picture mades it look anodized or gold color.