Correct bolts for Poston headers and crossover

[49-blues]

Anyone know the correct thread and bolt size for the crossover pipe on the high performance Poston headers? there are 4 of them.

 

[tom j]

I believe they are 7/16 x 2 1/2", I'm not positive on length(2 1/2)

 

[49-blues]

Thanks, i ll try that cause 3/8"s were too loose.