Vintage Blackhawk Transmission Jack

[70L34]

Hi everyone, I have an old Blackhawk transmission jack that could be a T1 model from what I’ve researched, but the label is illegible. While the ram does operate, there is enough pitting on the surface of the rod, in addition to the ancient seals, that it drips maybe half a teaspoon of oil on the ground each time I pump it all the way up. The rod is 1.125” in diameter and I have seen an online vendor that claims to have the seal kit for around $50, but there are five different variants of kit and I’m not sure how to confirm which one will work for this jack. Any help with identification, as well as a recommended vendor would be awesome. Thanks! -Tony