[maple_leaf_eh]

Unless my memory is wrong, the AMU mount bolts directly to the chassis above the spare tire. If you need more ground, I wouldn't use the roll cage. As I recall it is only 'pinned' in place with push-button pins, not permanent fixtures.

Speakers were entirely optional. My unit never had any - or never cared to issue them. We just made do the old fashioned way with headphones and handsets. The holes on the dash could have been anything, including for a fire extinguisher. I don't remember any sort of mike holder. Most guys slipped the clip over the windshield tiedown strap, but the cord bouncing around made the mike itself into a lethal weapon!