You'll need to get a COA from PCNA (go to Porsche website's Classics area) to know what was originally in your car from the factory.
make sure to double check the interior color code number against the 1970 MY dealer materials at Bowlsby's website, cuz the PCNA staff regularly misinterprets options & color codes on older P-cars' COAs. It took me 3x to make them correct #31 to Beige for my 73, because they wanted to call it black, which is #11 - see below.
Jeff's website only has 1971 (no 70 MY) interior & paint dealer samples, but I think 71 was the same color choices & 401 was brown smooth & perforated (inserts) leatherette (or 400 Corduroy inserts) with 400 brown perlon or pile carpet:
http://www.bowlsby.net/914/Classic/PaintFabrics.htmThe 71 MY interior color codes are shown below & Brown was #21 or 22 - depending on which seat insert material was used:
Click to view attachment You'll also need to know from your COA or the original window sticker or dealer invoice which options or Appearance Group of options were oriinally included, for the carpet type (pile was a separate option or in the App. Grp. for 70 & 71 MY).
COA Tip: if you have window sticker &/or new car dealer invoice, then Porsche gives a discount for that ($20 IIRC), plus PCA members get another $20 discount (as well as 20% off of parts/accys., 2 monthly magazines, events) - so joining PCA can actually save more than the $46/yr cost if you're buying a lot of stuff.
Hope this helps!
Tom
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