Synchro Gear Teeth, 1st – 2nd Gear G50 type . These synchro hubs are for the 5 speed G50 type gearboxes. Use with our 514.310.SCF billet steel with carbon fiber synchros or with the original 950.304.311.02 bronze / moly synchros, or 950.304.311.30 steel / moly synchros. Manufactured by us right here in Colorado from the finest domestically produced triple-alloy steel. NOTE: picture is representitive, not actual part.