not too many LCD clocks are curved. might be best for you to inset it and place the clock on a plane. This will make more sense visual and allow you to kick out the 3d data of a plane that will mane the AE work easier.

Alternatively you could simply set the selection of the polys and apply the texture to it. Aim for the size you think it should be and then adjust accordingly. It will take less time than trying to measure.
