RTS’ replacement bellhousings are cast aluminium production style bellhousings built to Ford and GM specifications, ensuring you of a high quality product that’s right for the job. Some applications may require minor modifications for transmission clearance and mounting. Features: Lightweight cast aluminium design similar to the original equipment bellhousings Lower cost non-SFI rated option for projects that do not require a steel SFI rated unit A356-T6 cast aluminium Designed for hydraulic and mechanical fork throwout bearing linkage Bellhousing depth: 6.45 in Clutch fork opening: 2.125 in x 3.3 in Transmission bore diameter: 4.684 in No hardware included LS correct dedicated bolt pattern, will also fit SB & BB Chevrolet Note: will not suit Holden V8 with GM/Chev bolt pattern.