Maybe this part?
73343 GUIDE, REAR SEAT SHOULDER BELT, RH
73343‑50020‑A0 IVORY, TRIM0* 1 € 14.02
73343‑50020‑B0 BLUE GRAY, TRIM1* 1 € 12.81
73343‑50020‑C0 BLACK, TRIM2* 1 € 14.02
73343‑50020‑G0 AGATE, TRIM6* 1 € 12.74
73344 GUIDE, REAR SEAT SHOULDER BELT, LH
73344‑50010‑A0 IVORY, TRIM0* 1 € 14.02
73344‑50010‑B0 BLUE GRAY, TRIM1* 1 € 12.81
73344‑50010‑C0 BLACK, TRIM2* 1 € 14.02
73344‑50010‑G0 AGATE, TRIM6* 1 € 12.74