Since I haven’t bought an S2(plus) recently I can only aswer from my own position.
In June 2018 I bought a (eg.: the last) copper S2+ from the first series.
When I needed a short pill I noticed Simon no longer sold it, and neither did FastTech.
Even if FT calls it temporary out of stock I don’t think it will ever come back.
Then I noticed Kaidomain still sold it, HERE
This pill is interchangeable with pills of same age Cu and alu S2+’s and all S2 models.
I never realized there were two Gen copper S2+ ——- There’s the other copper S2 type lights simon built that have totally oddball threads — If you’re looking for a pill for the regular S2+ that use the short reflector — I have one — A picture would help — I would like to see the two you are talking about —— I thought I had them all
I have two copper S2+ and can confirm the thread for the pill is different and not interchangeable between them. One of them was purchased in the first copper run and the other in the second run.