Ohh, you want the measurements for a GB1 teardrop knob?
Why Didn’t you say so?
I did some quick measurements based on the scale plans also available from perusing the reference section and came up with this. (I included my work, to allow verification of my findings, but the filesize is kinda big.)
http://img709.imageshack.us/img709/6563/parksteardrop.jpg
Ask and ye shall receive.