I don’t know what they are they may be regular ass flat backs haha
I was looking at my "set" of those 4 bakes that I restored, two Tula's and two Izzy's, one flat floorplate and one "field goal post", and all but one are ridgebacks. Need to dig through my bakelite bin and see if I can find a few smooth back Tula and Izzy bakes and list them on GunBroker as a set. I just need a Tula longtop, and maybe a nicer Izzy longtop too.