Vibration dampnener bolt?

So I started stripping the six in my 66 Mustang for removal.
I went to remove the dampener and there was no bolt! Removed the dampener with a puller and figured I would pick up a bolt at the parts house.
None to be found of course...
Looks to be a 9/16x18 fine thread. Probably 1 3/4" long.
Going to hit the junk yard tomorrow that usually has a few Ford six's laying around but with my luck who knows if they will have any.

Question, anyone know if other Ford engines used the same bolt?

Thanks for any help!

you might try a bolt from an early 289/302 engine.

I was hoping those would be the same. Probably more available at the j-y...

i am not sure they are the same, but from your description they sound close, but it has been a long time since i have even handled the dampner bolt for my 289.

I snagged one from the tractor supply shop. But those stores are probably more prevalent here in Iowa...