Belt Sizes – Routing and Pulley Diagram

No IC
Grand Prix
3.8 (Stock): 667
3.2-3.6: 660
2.85-3.1: 650
2.7-2.85: 642

Bonneville
Stock: 721
3.4: 716

With ZZP Stage 2 IC (2.25″€ tall Core)
6 Rib
3.3-3.8: 685
2.7-3.2: 680 (Note that the NAPA 680 may be too long for 2.8″ and smaller. Try a NAPA 672)
2.5-2.6: 672

8 Rib NOTE: For these belts the part numbers are 080 rather than 060…or K8 with the Duralast rather than K6.
3.0-3.2: 685
2.6-2.9: 680

Gen 5 Blower 
2.9-3.1: 685
2.7-3.0: 680
2.4-2.6: 675

With ZZP Stage 3 IC (2.375″ Core)
6 Rib:
3.1-3.8: 685
2.6-3.0: 680

Gen 5 Blower
3.0-3.8: 685
2.6-2.9: 680
2.3-2.55: 675

With ZZP SSIC (1″€ tall Core)
3.2-3.8: 670
3.9-3.1: 667 (Stock belt)
2.8: 660

With MAP IC (2.0″ tall Core)
3.1-3.4: 680
2.8-3.0: 672

ZZP SS M90 Conversion
970 – SS M90 for 97/98
950 – 3.8-4.2 SS M90 for 99+
947 – 3.5-4.0 SS M90 for 99+

Other Belts

060915 – Stock accessory belt for 99+
-also works with either UD WP pulley or OD alt pulley but not both.

060923 – Accessory belt for 99+ with UD WP pulley and alt UD pulley.

4060935 – Stock accessory belt for 97/98 (94″).

4060938 – Accessory belt for 97/98 with underdrive pulleys.