Hi-i see this post is about a week old, but i just saw it. I have a '71 CMR catalog in my lap now. This kit looks a lot like several of the kits you mentioned-except the catalog says they come with "pre formed PLASTIC fins". The shape of the fins favor the Rapier, but the BT dia is .890 " and are even with the bottom of the tube. The Effy has much broader fins than the one in your pics. Hope this helps (some), let me kno-i have many later versions of the catalogs & will look if needed. dan. oh-"pop" lugs were optional, not part of the kit. The 2 stage "HYPER" had plastic fins too-that go to bottom of tube also, and see none with spin fins.