sonoraed asked me to post this over here on the AC forum. This is my semi custom under dash vent setup. I used the #492000-VUA and split it between the center vents and extended it for room for the controls. I think it looks pretty stock and is now the perfect width.
I used some extra ABS I had laying around, and some ABS glue from the hardware store. Filled the voids with bondo and sanded/painted it with a texture paint to try and cover up any obvious signs of modification.
Vintage Air Magnum IV Install on a 80 Wag