When replacing your turbo the old adapter o-rings are dried & cracked. The o-rings are a necessity for top performance & sealing of your turbo.
This replaces the GM factory o-rings:
Seal adapter to turbo ( o-ring ) 25515935 GM part number # 25515935
Seal adapter to intake ( o-ring ) 1262817 GM part number # 1262817
Need a Ported & Polished turbo adapter Click Here
