They have partial kits (cheaper) if the shackles are ok. I’d pull it clear apart to see the wear on the treads to bushing fit. There are rubber end seals (originally cork)that go on the tapered ends to replace too. I used front shackles on the rear to lower it just a tad.

Larry
Old man᠁Old truck᠁neither one goes very fast. All you need in life is TIME, PATIENCE and MONEY.
If you are missing one component, you'll need an abundance of the others two.