I've done a set. I used uni-boots ,reused the old cans and swapped sides the axles run on to even out the wear. (Uni-boots cost only about $10 each.) The balls make a little pocket on the joint half that they run against. These axles had about 355K on them and I'm 99% sure they had the original boots on them. I remember seeing a date on them. I could have bought some axles, but I wanted to see if I could boot them myself. It's somewhat challenging.

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Diesel-guy