The space under the dash is the same as you all know.

The difference is that Gen II Super is slightly longer. It will still fit and if you modify the cowl vent handle slightly you can keep the vent. When I installed mine I made a bracket on the firewall to attach the back of the unit to and a cross brace under the dash to attach the front of the unit to. My objective was to make it drop in or out for future service.

Also keep in mine that the "kit" from Vintage air is a great way to go for a truck. It comes with a SD7 Compressor. Fine for a truck but if you want to put a dual system in with rear air on a Suburban it may not have the capacity to run both at the same time.

If you have never done an ac install before get the kit.