the ball guide ?
its length is 2-31/32
its bally part number used to be M-121-27
none of this will help.. you will only find it on someone wrecking a playfield. and no one wrecks ebd's.. that would be stupid
BUT ... the secret is.. the same wire was used on speakeasy and hotdoggin... finding a wrecked one of them will be easier
good luck on your search