peel'er open and see who actually makes the controller for the touchscreen. (you are going to need to know exactly which one it is to get proper drivers anyways.)
it's likely a 3m microtouch EX series, as that was the most common in the 17" era, but i've seen about 4 or 5 different manufacturers used in my time.
open it up and take a pic of the board (that way you can zoom in and whatnot) and gargle up the numbers on it.