For unibody tie in bracket (for front bumper/recovey points) would 3/16" steel be ok to use instead of 1/4"? I'm asking cause I dont have any 1/4" but do have access to 3/16"

 

3/16 would be just fine

 

Ok I copied a diagram off the internet for the unibody brackets but it doesnt specify the size of the bolt holes. Its looking like a half inch hole. does anybody know off hand if that the right size?
this is the bracket.
http://www.greatlakesxj.com/tech/bumper_mount.pdf

 

Probably whatever size bolts you decide to use, except the steering ones of course.

 

Or measure the existing holes in the unibody and match them.