I have a 2006 catalog . Your part number shows as "Universal power brake booster/master cylinder and pedal assembly" The description reads: "This unit includes a universal bracket that is made of heavy steel and welds to the frame at your desired location. For cars with automatic trans only." There is no mention of bore diameter. Another master cyl in the same section with almost the same description says it has a 1" bore, so it might be that. Hope this is helpful.