First, you need to get a good look at a 68 AC dash and see what is involved. I am not knowledgeable on the 68, but the 71-72 models use different dashes for AC and nonAC. It is not a matter of adding the stuff, because there is nothing to hook the vents to.
my question probably was a little misleading. what i was wondering was how to convert the 1968 dash bezel from non-A/C to A/C. My '68 Elky has A/C, but I have the chance to get a mint none A/C dash bezel for my car. My dash bezel is torn up and is beyond repair. How might you then convert that non-A/C dash bezel to work on my A/C El Camino?
I've looked at a lot of these and 69 dashes. It seems that they all came molded as non AC dashes and were cut by someone on an assembly line. I know that on the 69 dashes, there is a pattern molded into the rear of dashes without the "astro vents" to show where the holes get cut. I would assume the 68's were the same. In the assembly manuals there are instructions for the assembly workers to cut out openings for power top and defroster bezels, leading me to think that this would or could be true for the AC holes and such as well. Give it a shot!
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