TC, the suspension mounts you have are probably from early Workshop or Pacific kits. These go over the tension rods like RIMs do. Later PDP mounts went around the lugs the way regular DW mounts do and wouldn't fit any other drums. Workshop was an intermediate series between the Collectors and the Pacific kits. Made in Mexico but with conventional DW lugs. I have a snare from that series. I'm not sure what suspension mounts they used, but I had a Pacific Cx maple kit from that era that went on the tension rods.