So I am thinking the fan switch PN # is a 580- 20- 82 (with the 82 being Celsius) and that would be rated at 180F. 20mm core . - - - with that series 580 -- that is a stumper.
Lucas SNB748 may be close...
http://i12.ebayimg.com/04/i/001/2a/64/2d0c_1.JPG