HO Scale Kadee #262 Narrow Snap-Together Coulper Gearbox (10 pr)
Narrow Low Profile Snap-together
Gearbox for Whisker Couplers.
(except #143, #144, #145 Short Standard Head Whisker Couplers.)
2-56 screws are the most commonly used for center hole.
Screw length will very depending on the mounting situation