Actually the pre 2K cockers have a smaller diameter banjo bolt so the 2k Plus front block will not fit unless machined to the bigger bolt. Also the trigger frame internals are different for the stock slider frames. pretty well everything else is a match. Must say I also still Have the video around someplace Jeff. And about 6 Cockers I keep tripping over. My red Skull cocker I built still works but could use a good service.