I only have one at the moment
and thats not built but is just sitting quietly waiting for the time to be unleashed again
I did contact PUSH but they do NOT currently do this modification. They did, they think
in the last century but have no official records.
Personally I would suggest either getting a full refurb done on the existing one, look here
or keep a look out for either a Coupe or Super Deluxe. These do regularly appear on ebay and a few other websites. There seem to be NOS ones coming up quite often BUT the price can vary from ridiculously low to stupidly high.
Other than ebay these three sites did offer these shocks for sale until quite recently
MILWAUKEE BICYCLE Co http://www.benscycle.net
- various suspension parts
-suspension parts and bearing upgrades
Trunion shocks Coupe and Super Deluxe and Lobo Pull Shocks
My advice is to grab them whilst you can. Without the shock these frame are nothing but scrap. I've no doubt that these will get rarer over the next few years as LTS / STS owners start to hoard. I have two spares, a Coupe and a Super neither of which are for sale unfortunately.
You might also want to keep a look out on Pinkbike, Southern Downhill and STW as I have seen them on there