Re: So when in 1972 did GM start installing single wall tops?
My '72 blazer was built in St Louis, but had a double wall top. The holes to mount it looked to have been hand drilled, not very well, and the factory cage nuts for the single wall were in place, but filled with seam sealer before paint. Cant imagine they would put those in if they didn't put single walls on some of them? Also, mine doesn't have a speaker in the dash.
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