Rear Bumper Bolt Size

Hello again all,

I'm back (bought my officially totalled XJ back from my brother). Does anyone know what size (head, threading, and length) the bolts for the rear bumper brackets are? I need all the bolts because a new bumper and brackets are going on, but I can't reuse old ones bolts. Also, I could use any info people have about the screws or bolts holding the end caps and bumper guards on.

Thanks,
Chris

'89 Cherokee Laredo 4.0L