[64shortbox]

I'm sorry on the dash controls for your GMC, I'm not sure what to do about that but on my 64 C-10 I also didn't like the plastic A/C vents. One day when walking through the local self serve wrecking yard I found a pair of metal chrome vents on a 64 (I think) Chrysler New Yorker. They were cheap - like $4.00 each. I mounted them and eventually found a 3rd center vent on eBay for $25.00 and bought it. This was done years ago before corvettejim started reproducing the correct vents for the 64 - 66 C-10's. Her's some pics of what I came up with. You might want to try just wandering through the wrecking yards and see what you can come up with as far as the vents go.