Well,
1/ does the inside dimension fit on the bolt of the spring with a small amount of movement??
2/ butt the two bushes together, are the shoulders of the bush the same width as the leaf spring?
3/ O.D of the main part of the bush, is it similar size to the ID of the spring eye?
If NO to any or all of these questions, send the kit back. Take lots of measurements and head back to the parts store. I know that Nolathane consolidated part numbers on slow moving p/no, which was annoying. You may want to ask for Makay rubber bush replacement....
Good luck, let us know how you go.