Tried on the horizontal stabilizer for fit and contol cable check. Went on easy and lined up horizontaly and square. Didn't mess with angle of attack. Was 3770 mm on both sides fron metal tip to firewall. Installed two lights on panel one for start one for alternator. They are peanut lights theConnies used for prop sync. Not sure of voltage, will have to check. If no good will use other sockets with 363 or 1811 (now 1816) bulbs. Requires a larger hole so it will O.K.