jack,handle and base

Hey guys,whats the difference on jacks, I have a jack ,handle and base that came with my 79 Dodge van, I always kept it in the sleeve that came with my van conversion when I bought the van new in 79 . Some how when I got rid of the van a couple of years ago, the jack didnt go with it. I put it in the Duster and have been carring it around since then. It fits perfectly in the jack holder on the side ,the base works fine with my spare. So I wandering what is the difference between jacks on these mopars.

Bob