Hi guys. I have got a few of these shocks. What i can tell you is that ALL the parts you need to rebuild them are all still available from KTM/WP, well they were around 2010-2011 and i see no reason why they wont be now.. I have all the part numbers, all the information, the dimensions, spec sheets, damping etc etc. Even if you cant seem to get the genuine WP parts easily, all the bits are available from bearing/seal shops even though the shafts are 12.40mm. The crazy thing is they used a 12.70mm wiper, 12.50mm DU bush and a 12.00mm seal. They call the seal 12.40 but i measured the ID of a new one tonight and it measures around 11.80mm so i'd say its a common 12mm one and the same seal as what is in the Ohlins twinshock seal heads. its a common 'stepseal' eg Turcon 'Stepseal 2K' from Trelleborg Seals, or a Hallite R16 https://hallite.com/products/rod-seals/r16/ or 716SPN https://hallite.com/products/rod-seals/716spn/. I will do my best to put a full parts list on here with details. It will take me several days or a week to get it all organized properly. I will probably do a spreadsheet and attach it here if i can. There were sveral generations of the WP shocks for the TRX too. Once you have all the part numbers its a simple matter of ordering them from a KTM dealer or a decent WP dealer. I always find it best to get the parts from WP Germany as they could get the parts from the factory in Austria. At the moment i definitely have an over supply of the wiper seals. I got a few 100 of the exact seal used by WP and i got them from the manufactuer 'Eriks Seals' who supplies WP. i got them through Eriks Seals in USA and they got them in from Eriks in Holland. It was a special order. The way i worked out that they were Eriks brand wiper seals was because i removed one and i could see the name and size of 12.7mm written on the wiper. You need some proper tools to disassemble the seal cap and get the DU bush , wiper and o-ring out. i can a special bullet made made up with a lip on it that would press out the bushing and wiper. These shocks were always sold without springs and you were to use the original 4 wheelers front springs.
There is a rebuild kit available for these shocks and the part number is R301. Its available from KTM but probably a special order. Not many dealers stock it outside of europe.
Don't pay too much attention to this price because KTM AU are a rip off.
This kit only has the bare minimum parts and does not include the reservoir parts, compression adjuster parts, mounting eye seals etc but usually all that can be got from a seal shop anyway.