Retractable belts, fitted on the wrong angle, will chafe on the steel pressed outer body of the retractor untit, and wear the belt very quickly.
The frayed webbing will not be nearly as strong as it should be.
Also, they will not like to un-reel - ie you cant put your belt on. There is a small ball device that is sensitive to angle, and about 3 degrees is all you have to play with.
We carry (probably) the largest range of seatbelts in Adelaide. PM me for any details you may need. Can do a special ausmini price.
Easy when its your job
