Hey Bobby:
US Divers is now Aqualung, I believe. I have old US Divers Rocket fins (in BAD shape), a USD Conshelf SE2 regulator and a USD branded "kill knife" about a foot long. These are definitely old skool. I dunno when everything changed but it was years ago. Maybe some of the more seasoned divers and SB'ers who know more about the lineage can weigh in on this.
Now as far as the parts kits, well, if you don't know which regulator you have and which rebuild kit you need, I would hint that maybe self repair will not be your best option right now. I know with my SE2, I could use
this for my first stage and
this for my second stage, but it is a lot more than taking the o-rings out and then putting them back in reverse order. Plan on disassembly, cleaning, drying, inspecting, reassembly, testing, and then readdressing any deficiencies. You can't do this with just good mechanical inclination and nothing else.
I would suggest that you pick up Vance Harlow's and Pete Wolfinger's books. These are not how-to repair on all brands but they give you an idea of what to expect. Also, the repair documents for most regulators are floating around on the SB. Do an advanced search though. maybe after all of this you can discover your regulator type.
And finally, repair you regulators at your own risk. You will be your own test diver. Nuff said.
I hope this helps and don't get discouraged. We all have to start somewhere but we also rarely think of all of the aspects and repercussions of things go awry.
With kind regards from North Carolina,
Thomas