Finned 1 1/8" carburetor extension kit. Polished fins supplied with hardware.1 1/8" Finned Amal Carburetor Extensions (28mm)$68.00PriceQuantityAdd to CartDetailsMaterial: Aluminum Size: 1 1/8" (28mm) Bore x 1" thick. Holes 5/16" @ 2" centers. Studs and nuts: Grade 8