Sapper19

I've been looking online for a few hours but can't find any info on the size of the bolt used on the grab bar. I've seen the replacement bar from Carolina Metal Masters and found the part numbers for the pieces of the stock grab bar but nowhere is the size of the bolt listed. My goal is to find a place to mount a base for a Ram Mount. The CMM bar comes with a bolt that has this but I'd rather not pay $155. I like the custom grab bar but it's not for me. Ideally, I'd like to replace one of the bolts with something like the base below. I've got a couple of them on my motorcycle and they work well.

Motorcycle Handlebar Clamp Base