Est Medicina Luto

This is going to sound silly -

Does anyone know the thread pitch of Toyota Part No.: 90164-45005? It's the screw for the dome light in the center of the truck (not the one with the rear view mirror or by the lift gate)

For various reasons I need the same screw, just an inch longer. But I can't find a match using a thread gauge. The people I've taken it to say it's very close to 1.75 - but not quite a match.

Thanks -