WTB: E30 Radio harness and Style 5 center cap

[The Dark Side of Will]

I need to snag a radio wiring harness for the "deluxe sound system" for my Mom's car. That means it needs to have the fader connector.
We *THINK* it's #5 on this diagram:

RealOEM.com Home => Select another car => Audio, Navigation, Electronic Systems => Single parts f loudspeaker


Listed as:
05 WIRING 4-HANEL FRONT STEREO 1 61121386554 ENDED
05 WIRING FRONT STEREO 1 09/1987 61121386440 ENDED


But it might be #4 on this diagram:

RealOEM.com Home => Select another car => Audio, Navigation, Electronic Systems => Single parts f loudspeaker


Listed as:
04 Wiring set SOUND SYSTEM 1 61121381719 $200.16
only in conjunction with
-- Fader control with cylindrical connector HIFI/SOUND SYST 1 65121379325 $44.65


Any guidance on which is which?


Also need a single 151 mm lug cover for Style 5's.
Listed on RealOEM as:
03 HUB CAP GRANITSILBER D=151MM 4 36131179493 $76.75

Thanks!