Speaker 2-5/8 inch - 4 ohm 8 watt
2-1/2 inch-4 ohm 8 watt square speaker used on many pinball machine backbox speaker assemblies. Hole to hole 2-5/8 inch diagonal and 1-7/8 inch horizontal/vertical
Used in Gottlieb pinball speaker assemblies.
Depending on availability, speaker may be a slightly higher wattage and is considered an upgrade.