1988-98 GM Fullsize truck split face grommet GM 1" sight glass and mounting

1" sight glass and mounting feet are optional

Laser cut from 3/16" AR500 steel

drill the 2 existing screw holes to 3/16" to allow new 10-32 flat head screw and nylon lock nut

Designed to mount using factory fan shroud threaded mounting holes

Adapter plated to retrofit GM hydroboost to almost any car/truck with the GM center hole booster pattern

1988-98 GM Fullsize truck split face grommet GM 1" sight glass and mountingCustom fit, 6061 billet aluminum split face grommet to utilize factory opening in firewall of 1988 98 GM C K 1500 OBS full size trucks. Grommet holes are designed to be used with Holley EFI engine, power, and transmission harnesses. 3 hole variant grommets have: . 5", 1. 0625", and . 7" holes 2 hole variant grommets have: 1. 0625", and . 7" holes To install these, remove the factory harness on the right side of the firewall, drill the 2 existing screw