I was going to give you a link, but what I knew as CERTAC doesn't seem to be there anymore. Perhaps they are Cerberus Tactical now?
https://cerberustac.co.za/shop/
In any case, I believe they were a CheckMate 8 round extended tube, wadcutter feed lips, and I think used the CheckMate Patented Follower (CMF) with no dimple. By the way, the Tripp "flex" follower (not the Tripp hybrid) originally didn't have the pimple either, which is also the CMF, though I don't know what they use now.
Here's a 1911forum thread with them
https://forums.1911forum.com/showthread.php?t=223596