On Reply? there are two pages of links to similar clamps
Try folowing up the MSC/J&L links that I and one of the other posters put up, they are broken over time but a bit of effort will find a clamp of similar design to the non available crab ones
open this and go to page 793
Also from that old thread, these
Edited By JasonB on 25/05/2016 09:54:47