Then there are the various Stevens pads

'T'pad found on the 5100 and others

[Linked Image from photos.smugmug.com]

Jostam "Anti-Flinch" but with 6 cut outs; on a 620 Deluxe.

[Linked Image from photos.smugmug.com]

And this pad

[Linked Image from photos.smugmug.com]