Period correct header bolts
 

Day two header bolts.

What came with some of the popular headers.

Hooker ?
Doug's ?
M/T ?
Crargar ?
JR ?
Headman?
Other ?

I remember using the bolts supplied with the headers on my first set I installed. I then started using Mr Gasket, Moroso, industrial supply on the following sets.
This was back in 1981 day 3 time period.