Dropping the rear of my 64, what to use.

Hey i got my spring hangers in today. They were supposed to be black, but they came with the yellow coating on them. I thought maybe they were the wrongs ones, but they fit in the holes correctly. This set came with the studs in place, another set i was looking at didnt have the studs at all or the second eyelet for lowering the car. I might not need the lowering hole, but it doesnt hurt to have it and it was cheaper then the regular hangers without it.