Authenticity Series/Red Book discrepancies on a 74
 

I was going through both references and have noticed that some info is not accurate or is missing detail. For example, my rear deck grill is a silvery metal, "AS" states the grill was plastic. My owners manual says I have the K22 option group. There is no reference to this in either book. My interior per the manual has leather in Blue/Black. No mention of this color in either reference source. There are other inconsistencies as well.
Do I have to pay for the Kardex to get more accurate info?
All responses appreciated!

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Dan S.
1974 911 Targa

I have some brochures (middle year ones) with option lists, I'll have a look for K22, Dan.
My '75 Targa has the "black look", i.e no chrome trim and the rollover bar is black. It was an option like M47 or something, I have it written somewhere.

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'75 911S Targa
'81 BMW Alpina C1 2.3

Saffs,
Thanks, any info appreciated!

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Dan S.
1974 911 Targa