I'm not the man who can proof things that happend more than 35 yrs ago
but I do know that many things
can happen in 35 yrs
I remember the long discussion with Dave Fagan about the rear bumper of DGU914H - he was absolutely sure that his /6 has got the correct bumper (the "round" one), but I was able to proof that the car was delivered with the old style rear bumper ...
well, I can't proof every single case, but in general only the MY'70 cars were delivered with the sharp edges bumpers
imagine following - in Sep 1970 you drive your MY'71 car and hit something with your chromed, "new" version rear bumper; you let your Porsche dealer replace it and they have a MY'70 leftover sharp edge rear bumper; hardly anybody would notice it ... and so, 35 yrs later some guys think that's stock
other story - someone who has a 914 with early style chrome rear bumper does a conversion to FG bumpers and stores away his chrome bumpers; after a long time in the back yard they're rusty and ugly and he decides to scratch them down to bare metal and paint them in a "stock" colour, because re-chroming would be too expensive ... and so we have an "original" painted early style rear bumper
see what I mean?
nobody can tell us for sure what definitely happend within the last 35 yrs - me neither
but at least we know what the "standard procedure" was - and so we can assume what's stock and what's not
just my 2 cent ...
Gustl