1967-1994 GM 9" Dual Diaphragm Booster. Delco style w/Short Thread Product Description:

• 9" Delco Style Dual Diaphragm Power Brake Booster
• Exact copy of Delco with Short Threaded Rod
• Black Finish
• 3.75" Length Rod
• GM 3-3/8 Bolt Pattern
• Works as an universal power brake booster when purchased with universal pedal rod PRE5564 & PRE6772-18 clevis.
  DROPSHIPS FROM MANUFACTURER