Ceiling Mount Screws

Dear Everyone,

 

I have a Dell 4100MP that I lost the ceiling mount screws for.  Can't seem to find a good replacement for them.  I still have the mount itself just missing the 3 screws that attach it to the BOTTOM of the projector unit.

 

I need to know the size, length, pitch (thread size) of these 3 screws and the size of the spaces that were used with the unit.  If anyone has this information please let me know.  I don't want to have to buy a new mount just for the screws...

 

Thanks all

qmibkim