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A friend of mine who's not currently registered has some stock 57 a/c vents, but no instructions on where to locate them on the dash.

I did a search, turned up some limited info, but not enough details.

What I need is the dimensions to locate the hole center, and what the hole size is.

I saw where Jims57 made the hole with a 3-1/8" hole saw and enlarged it. What size does the hole saw need to be if you have to buy one? 3-1/2"? That's the size for 55-56.

This is on a finished, running, nice car - so there's no room for hiccups.
 

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Rick I think 3 1/2 might be too large. My initial hole did not require a lot of enlarging and was enlarged until it fit the vent. With a good carbide burr it would be very quick work.
Jim
 
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