Spacers
The first thing that confused me is that 60s can have one of two setups in the rear: springs with or without spacers. Without is the standard setup on your average truck: springs held to the axle with u-bolts and spring seats. But with the spacers, you have a metal cover over the spring seat and within the u-bolts. Then there is a rubber "spacer" between the spring and the cover, and between the spring and spring seat.
I'm not sure what the spacer is for, but someone suggested it might be to distribute the stress on the u-bolts more evenly. Or perhaps it's to give a softer ride? In any case neither system is really any harder to deal with, but there are a couple things you should know.

First, the length of the u-bolts is different if you have spacers, and if you don't.

Second, the diameter of the hole for the centrebolt in the axle mount is also different. This is because with the spacer, the centrebolt fits into the metal cover which then fits into the axle mount. Without the spacer, the centrebolt goes straight into the axle mount.

My truck has the spacers, and so we had little problem with the centrebolt (we did have to remove a sleeve on it, so that it only protruded about 1cm). But on Shaun's, without the spacers, we had to grind down the head of the centrebolt to make it fit.


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