93 rear coupe 3 point seatbelt

[O’s-coupe]

Hello everyone, so I am wanting to instal factory 93 rear three point seatbelts in my 88 coupe. Just wanted to know if I have to change the whole package tray sheet metal to a 93 or is there a different bracket I have to purchase. If anyone that has a 93 coupe if you could send pics of how they are mounted up by the rear windshield (the retractors) I would appreciate. Can’t find any junkyards with the car so I can see myself these cars are unicorns now.