Ceramic heater bulb diameter?

Hey all, please can someone tell me the diameter of a 100w zoomed (let’s say) ceramic heater bulb: I'm almost done making a melamine cage, just need the heater, but I live in Perú and shipping will take a month or so. So I need that measure to place the socket and make the bulb cage (I’m going to use a household red bulb in the meantime) thanks for the help.

Mine is 3 5/8" wide with a total height of 4 1/4" and a height once screwed in of 3" from the start of the socket to the head of the unit.

That's a 100 watt ceramic heat element.

Great! thanks for the info