I actually had ordered a set of those hold down springs from Rock. You take a small screwdriver or punch and push inside the spring to hook it onto a clip on the backing plate.
There are two different shoe retention set ups depending on the year, there’s only 1 hardware kit that’s widely available now and it’s for the later style.
I don’t know all the exact details since I don’t mess with rebuilding front drums at all and just convert to disks. From what I understand the later hardware kit does work but it has different parts especially for those shoe retention pins. There’s a thread here somewhere on it.
I kinda doubt that’s your issue, but it’s probably why you have hardware you don’t recognize.
