external gears for servo motor

I have a servo motor that I'm using for a project. I want gears that will attached directly to the shaft of the servo like the arms that come with it do but I can't find any. I've seen some that are for sold for futaba and hitech servos, however those are too small. I would like something in the range of 1.5-2 inches. Does anyone know where I can find them?

Servo city has some.

https://www.servocity.com/html/gears.html

These are really cool adapters. they allow you to attach any .250 bore device.

https://www.servocity.com/html/servo_shaft_attachment___250__.html#.VJpRaKxE_g