Got a rather nice adjustable capilliary one sitting in front of me, made in Italy by IMIT so may be available in the states,0-120deg C type tr2 9325. Contact 1 I think is make on temp fall rated 16(6)A 250v,contact 2 make on temp rise 6(4)A 250V.What are you using for a rad fan ?,I found that the motor and fan from a dismembered 9" cheap desk fan bolts straight into the fan bracket on a Nissan Micra rad,blades needed a bit of trimming.