1969 Chevelle Jack

[69 Post Sedan]

I’ve been looking at bumper jacks for my 06C Kansas built 1969 Chevelle. I’ve seen a few different versions.

I know mine needs the square shaped mast, not the T shaped.

The problem is, I’ve been seeing two differently stamped hooks, one with a “UN” stamped on it but not the other. Also, the main housing with rivets that have a date stamped on it but one that just has an “S” stamped on the rivet but with no date on anywhere and this guy has had the car for over 20 years, being positive it’s not a repop.

Can someone enlighten me on what’s correct and what to look for.

Here are some pictures to show what I’ve found….the picture of the “S” on the rivet is the one with the hook without the “UN”

Thanks in advance, Kurt