Body Mounts '66 LeSabre Convertible

[Tinny]

Hi guys.
Can someone tell me the thickness of the body mounts on my LeSabre please. I've got to fix some rust around the mounts, so I figure I should replace the mounts while I'm there
The ones on there are about 1/2 inch thick by just over 2 inches across, I'm guessing they have compressed over the years.

The ones I've found online are 7/8 thick, is that correct?
Also, are Chev / Pontiac 'B' Body mounts the same for around 1966?

The photos show the mount just behind the left side rear wheel.
If anyone knows a good place to buy the body mounts, that would be appreciated too.

Thanks.