This is only for push to choke ignitions, the original switches of the 60's thru late 70's start at key numbers 101-130 for a total of 29 keys and push to choke start at 1A-2F for a total of 12.Matt, For most of it's existance Merc only had about 10 different keys.
In the ignition switch or on top/side of box?This does have the push to choke button