These Butterflies are finely detailed showing the cross shaft and screws holes for each butterfly disc.

They are made to fit the Competition Resin's '70's Ribbed injector hat. 

They measure .215" diameter and may fit your particular injector.

Just drill out your openings, insert a cross shaft that connects the throttle linkage and barrel valve and install these butterflies on the shaft.

Assembly required for installation into injector hat.  Injector hat is not included.

Contains three nickel silver butterfly discs, .215" diameter, 1/16 scale.