bushings for back of leaf spring

I searched but didn't quite find the answer to the question i have. I bought new shackles and the kit includes a bushing for the spring but I don't know if it's going to work on a ranger. The bushing is basically 2 metal spacers with rubber sandwiched in. Is it a press fit into the spring or what? Thanks.

This is what i have: Dorman - OE Solutions Rear Position Leaf Spring Shackle Kit 722-001: Advance Auto Parts