Looking to buy the following used parts preferrably from one place if possible

1. Fuchs polished aluminum, ring type center cap, w/o holes for removal
2. Housing for interior light
3. Black plastic seat belt stop
4. Intermittent wiper relay that mounts on the cowl brace
5. White clip for targa top that are in the rear trunk
6. Black plastic plug for bolster
7. Owners manual for a 75

Why buy used?
Most of these are available new at reasonable prices, as follows:

1 - IIRC PP has those, other usual suspects may too.

2 - The later version Interior light with the black button is a standard part common to VW & available widely at $5-6 online. The original white button ones are NLA but apparently come up used or NOS from time to time (I'm looking for one myself).

3 - ... don't know what you mean? Pic?

4. Jeff Bowslby makes these. Just look him up in search or at member vendors, & PM him (he just showed me some he has made up a couple of weeks ago). Then all you have to do is install the harness & relay from Jeff, clip out the retent in the steering column switch slot to allow it to move to the 3rd position for intermittent setting, as the factory did - do difference in the switch itself.

5 - available at AA, Pelican, PP/Automotion, SMC, etc. & even dealers.

6 - Check classifies for used ones for sale, & one member posted he'd found some new ones that work, but I don't recall his name. I got some & they look very close to originals.

7 - Try the ones at #5, as well as AA's Lionel at eBay & other ebay sellers, & classifieds at TheSamba.com under Porsche Parts & miscellany/books, 914club & here.