GM Service Manual Online
For 1990-2009 cars only

Bumper Gap

Shim Size

0.0-1.47 mm (0.0-0.058 in)

No Shim

1.50-2.57 mm (0.059-0.101 in)

0.64 mm (0.025 in)

2.59-3.68 mm (0.102-0.145 in)

1.14 mm (0.045 in)