Air Conditioner Compressor Upper Bracket question

I've seen various compressor top brackets on 455 engines with a hole drilled in the top of the bracket and a ground wire bolted to the hole. Is this factory and, if so, where should the hole be? Here's my 1970 bracket without the hole and the ground wire is secured with a nut and bolt to the corner of the compressor. How was this handled in the '68-73 GSs?

 

Factory yes and for 72+

 

This is a correct 70 GS455 with AC.

I thought you needed a shorter belt until I saw the pulley size.

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I'd like to see a photo of a '72 and up bracket so I can see where the hole is for the ground strap.

 

72

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I think it was a big car option as well I know the 3 68 to 70 GS ones, I had did not have a hole.

 

That’s what I wanted to see. Thanks.

 

71-72 used same bracket with small hole and screw for ground. 70 bracket was a totally different bracket with no small hole and bracket was a totally different angle.

 

Big car 455 and GS 455 used the same brackets