401 Nailhead balancer bolt socket size

I need to pull the old balancer off, does anyone out there know the socket size for the bolt? Motor year is a 64, not sure if that matters....any help is appreciated.

 

1& 1/8th

 

U have seen some stock bolts at 1 1/16th.

 

Yep,,, kind of depends on the year , I think,,,, I got both sizes on my cars.....:Brow: