1999 Buick Riviera Owner's Manual - Page 40
1999 Buick Riviera Manual
Page 40 highlights
yellowblue 2. Slide the guide under and past the belt. The elastic cord must be under the belt. Then, place the guide over the belt, and insert the two edges of the belt into the slots of the guide. 3. Be sure that the belt is not twisted and it lies flat. The elastic cord must be under the belt and the guide on top. 1-34