If you don't find a nice door in that color that is rust-free with do dings & good paint, then just get any early door from a 70-72 that is rust-free & in as good a shape as possible (no dings) & get it color matched repaint to match your 914 (colors do fade).
Chances are slimmer to find a match for your Tangerine.
FYI - 70-72 is one type of door, then 73-76 different - with a different window lift mechanism, so you need to stick with you early type.
Good Luck!
Tom
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PS -