QUOTE(seventhchild @ Dec 19 2009, 08:54 AM)

...nope, I'm looking at the number right now and it's only 901.131.00
Do you believe that every part in a Porsche has the full, complete part number cast into it? (Hint - No.)
Never did I say that's not the number on the part - I just said that's not the part number...
(Virtually) every Porsche part has 4 groups - 3 groups of 3 which are basically:
platform.MainGroup.SubGroup followed (usually but not always) by a 2-digit modifier which might be size, or color, or some other minor differentiating factor.
But _lots_ of Porsche parts - especially foundry parts like cylinder heads - have a casting number which is often related to (such as by transposing some digits) the final part number. (A 911S cylinder head starts out as the same raw casting as a 911T head, and only after it's been machined with a certain port size does it attain 'real part' status and get a real part number...)
Some parts - such as this bearing, drop a group when the part is small and the group is obvious. (101 is engine parts.)
You will probably not find 914.6 parts at porsche.com unless they are very specific to the 914.6 -- you will find 901 numbers in the 911 section.