1968 K10 Front Shock Mounting Bolt Sizes (Generally)

[HairpinCircus]

Hello.

I'm replacing the front shocks on my Father's K10. Looks like I'm going to have to cut the bolts. I was hoping someone could tell me the sizes of the top and bottom bolts (length, diameter, pitch, whatever you've got). I want to run down to my local fastener warehouse and pick up the bolts before I do any work.

Also, I'm assuming they're 3/4? One has been replaced with a 16 mil and another with an 18 mil by the PO.

Thanks.