Arches bumper and colour code (280ge)
They look quite different from the typical factory fit of that era. (Early ones were made of glass fibre. Later ones were polyurethnane, but in both cases a little more rounded than those pictured)
that will be difficult (i.e. impossible); judging by the logo on the bumper it is a G modified by BB Auto, quite prominent in the 70s for tuning Porsches, innovative at the time but does not exist any more.
and found this photo on the internet with the corresponding interior, the good old Clarion tower, looked like a good idea at the time:
that body kit is too wide for the alloys, not a great look IMHO