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There are two BMW part #'s the C6 guys like and if you do the image search you'll see several different versions red, white, different manufacturers all in the images. There's Corvette Forum links to most all of them. Most are very inexpensive. I don't use them so I can't attest to one being any better than the other!
I don't use any different pad on my C4, however I use a hockey puck on my C5.
For the C5's and C6's some kind of pad/puck is needed if jacking from the side. Most of them are made to fit into the oblong holes in the frame that the factory used for shipping tie downs. The BMW jacking pads are one type that fits into these oblong holes and is designed to stay there permanently.
On the C5/C6's I use a hockey puck, but a jack pad like pictured could work well.