Should be easy enough to isolate that particular area.  If you have UVMapper, load the obj, select the material, then select Inverse.  Delete the current selection but DO NOT SAVE anything yet.  Now select what's left, which should be the bit you want.

Save the UV map only.

Exit UVMapper without saving anything else.

That should give you the template you need.

I'd be happy to do it for you if you could send the thing over, but I don't know what the copyright situation is on the file.

Coppula eam se non posit acceptera jocularum.

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