Clutch Master Cylinder fitment questions

Alin

Diehard Car Enthusiast!
Why in the hell aren't these compatible with a 2004 STi?!


http://www.ebay.com/itm/150904022977?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649
http://www.ebay.com/itm/02-03-04-05...aster-Cylinder-2-0L-OEM-Factory-/171318177830


Maybe the generic looking turd is a no no, but why wouldn't the one out of a 2005 WRX fit my car?

Edit: Just saw this now:

$_57.JPG


I took a look to see what it said on my car. Mine says 11/14.
What do these numbers mean exactly?
 
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