New GM ACDelco 

Coolant Elbow O-Rings

Not in ACDelco Packaging

ACDelco sells them in bulk packaging

3 Small and 1 Large O-ring

When replacing the O-rings on Dorman aluminum elbows

we recommend checking for sharp edges in the O-ring grooves.  

Dorman isn't the best at deburring the parting line of there coolant elbows.

Dorman O-Rings are Prone to Failure

Works on all GM, Pontiac, Buick, Chevrolet, Oldsmobile

1996-1998 may not need all 4 O-rings

Series 2 & Series 3 L67, L32, L36, L26