Foo - definitely looks like a 911 reflector, & I've never seen such large mounting holes for one. IMHO - a really crappy job they did, whomever "they" wuz!?
You may be better off cut-n-welding-in a new rear face panel there. There are several 914s on here now parting out & cutting up if you want to get the rear face panel at this time.
... ahhhh, the ever expanding scope of a resto project - you just gotta love the never ending list!
On the Wheels - look at the Originality & History Forum, under "The Few, the rare..." under nailed topics at the top, & there are some great shots of Sahara Beige's OE finish on the Fuchs.
... However - 1st check on the back of your wheels to make sure that they have the correct part nos., Fox Head & VW roundel logos - & ergo are not repros (which are often sold black background like that). If they are repros & you want to do a full-on OE concours resto, then you'll want to find some "real" Fuchs 2L Alloys, & sell the fakes.
.... There's also a nailed topic on OE wheels & tires there at O&H.
Hold on a sec on the vinyl roof being wrong bit though! ... not sure where that came from, unless it was our joking around with each other on here?
Last - to clarify on the vinyl -
914's with the Appearance Group set of options - or as an individual option - DID indeed come with a pebble-grained black vinyl & chrome trim on the rollbar top (under the targa top) & on the outsides of the sail panels (rollbar sides). The chrome trim on yours is indicative that it was probably on your 914 (although it could be added or deleted from any 914 by a prior owner), but I cannot see if it is still the correct black vinyl material. This optional treatment was available for all years 70-76.
What George/dr914 & SirAndy & I were
fun at each other about, is the well documented fact that - in the early couple of months of 73 MY production, for some reason they experimented with adding the vinyl to the A-pillars & top at the windshield frame. So chances are when you see a 914 with black vinyl on both the rollbar/sails & windscreen frame, it's probably among the first 1000 or so built in the summer of 1972 - meaning basically August.
My 73 2.0 VIN....1954 has a chassis no. translating to 8/31/72 & an 8/72 build date on the door jamb VIN sticker (must've been the world's fastest 1 day final assembly!
) - but ....... I see no evidence of it ever having the front vinyl, although it had been repainted twice before I bought it in 12/75.
Get your COA & see if it gives any indication that it was in fact an option, but - unfortunately - the COA's & the Kardex/database records upon which they're based, are often incomplete, incorrect & the most common error - the old codes are mis-read by the person(s) doing the COAs, because Porsche change the various codes for options, colors, etc., but the person doing your COA looks up on the wrong car/model/year & writes it up wrong.
It just took me a year & 3 COAs to convince them that they were mis-reading the interior color code on my #31 - Beige interior, as they insisted it was black - notwithstanding the fact that they'd used #11 for Black & #31 for Beige correctly on other COAs out there.