Nevermind, i found it and i guess it makes sense, see quote below, apparently a very common problem.
The TranQuil Sleeve Kit is the "practical solution" for the notorious grooving of the quill that occurs on Subaru transmissions. Grooving of the quill causes:
Premature clutch and throw-out bearing failure
Now you can solve this problem and its results permanently with the TranQuil Sleeve Kit!
Takes less than 10 minutes to install, while replacing the clutch assembly
Does not require any modification or machining
Removable and reusable when doing transmission repairs that require splitting the case
Gives a noticeable smoothness to the clutch engagement
Eliminates noisy clutch linkage rattles
Allows you to keep your job completion time
Frees up the bay and mechanic
Eliminates the chance of costly mistakes in replacing the case
Eliminates towing expense and/or rental cars!
Kit comes complete with oversized release bearing instructions.
These can be bought here, probably worthwhile to do while you have your tranny apart. http://pdmusa1.com/