72 Burb rear A/C

[Burbaholic]

OK here we go with another question series on rear A/C for the 72. My burb has factory front air and came with the empty shell in the rear. I found a rear air evap and fan unit with the wiring harness on ebay. Here's my question - it doesn't appear that there are any holes in the body panels for routing the hoses and wiring. I figured there would be knock outs or some indication of where these run. Does anybody know the location and routing of the hoses? I saw some pictures of the drains (one on each side) that showed them exposed and routed through a grommet to the space between the panels behind the back window.

I would assume the main route is along the frame rails. The evap unit has the hose fittings on the drivers side but the tee connections for the hoses in the engine compartment are on the passengers side so somewhere it has to cross over?

Anybody who has had experience installing one of these I would appreciate your comments.