tamberins bumpers

A number of us have bought upgrade parts from SD Truck Springs I don't know if you'll actually want to get Timbrens but SD's deal might be worth a look. Also helpful when you call them.
There's also a competing product called SULASTIC. I've heard a few good remarks about their rear leaf shackle kits for Ford leaf springs. That's not enough for an across-the-board comparison but thought I'd mention it.