Hi, Jose.
Due to Haynes service and repair manual, the headlight housing should be the same on phase lll models. Regarding the seatbelt, the front seatbelts on phase lll models from 1995 and up, are equiped with mechanical seatbelt tensioners, Haynes says " DO NOT attemp to remove front seat belts on vehicles so equipped". I think you should find a belt solution from a 1991-1994 model.
Brgds.
Jensen :-) 1995 j63 2.2i "Limited"