If you look at the real Track-Ir pro clip..... and put gridlines over the picture, dimensions must be:
25
40
70
80
edit: 20-feb-2010
here's a new picture (sizes look different from sizes above, but it's a scaling problem)
28
45
75
88
If you can't make such a clip,
just buy it for $35, it is usb powered! I think this will work good with freetrack, but maybe it is power controlled by the real Track-IR software?
Who can confirm that it is working?