Roll bar installation question

[michel schryer]

hey guys,i'm temporarily installing my roll bars which are 1.500" in diameter and i noticed that the diagonal bars that attach in the trunk have a small hole drilled through,i thought it was to put a 1/4 bolt but to my surprise it's smaller,looks like 10/32. What do you guys put there normally ? Should i drill and put a bigger bolt but I don't know what's going to happen to the chrome if i drill through. My concern is if there's a roll over,what would hold the bar from beeing compressed down snapping that small bolt. I think a grade 8 bolt in there would be more appropriate.
Thanks

[mickmate]

We use two grade 8 3/8" bolts for the rear brace attachment. Chrome drills fine with a good drill, just put some anti rust juice on the bare metal.

[michel schryer]

Thank you Mickmate for your reply,it makes sense to put bigger grade 8 bolts,i will just do that,have a great day,cheers.