Aeroflow Holden 253-308 153 Tooth Internal Balance Flexplate - SFI Approved (AF89-308SFI)HOLDEN 308 153T INT BAL SFI Suits 10. 75" Converter Bolt Circle Part Number: AF89 308SFI Heavy Duty Flexplate 153 Tooth InternallyBalanced SFI Approved Holden GM Australia 253 304 308 Aeroflow's SFI rated heavy duty flexplates are manufactured with extra thick material and double welded. These flexplates will withstand the extreme power and RPM of today's engines. Available to suit Chev, LS, Ford and Holden. SFI certification sticker 29. 1 approved