I have a hardtop on my '78 that I'm looking to replace the ambulance doors w/ one of the earlier flip up rear hatches. Tried a search and didnt' find anything, so I'm hoping that means that it just bolts right in. By the looks of it, I'll have to take out the angle supports at the top of the hardtop, anything else? Are all the bolt holes on the hardtop just waiting for me to install this thing? Thanks!