About a dozen years ago I spent lots of time asking this question all over the place and ended up with two replies with pictures showing this as the correct spot. This was my car after I mounted the switch. I hope this helps.

Straight up from the splined shaft on the door handle.

I have to cut my panels for the power lock switches as well as the power vent switches so I'm glad you got me to search for that picture!

notop wrote:

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Also looking for tinted side glass for 1966 Parisienne convertible.

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 All 6 pieces?

I'm pretty sure I can find you door glass but the 1/4 glass could be an issue.

I thought I would post the interchange here for you in case it helps at all. It's a bit of a strange bird for the door glass and a couple of exceptions on the 1/4 glass as well. It's not as simple as any full size Chev Olds Pontiac Buick or Cadillac.

Door glass

66 Le Sabre or Wildcat conv

66 Electra 2 dr

66 Cadillac conv

66 Starfire and 98 2 dr ht

66 Olds conv

66 Pontiac conv 

66 Grand Prix

 

1/4 glass

65-66 Le Sabre and Wildcat conv

65-66 Chev conv

65-66 Olds conv except 98

65-66 Pontiac conv

 

Starting in 65 the full sized GM's had curved glass I'm afraid, so no option to cut it.