Found 4 aftermarket (automotive) switches that will fit ....but...
acording to napa,carquest the operating temps are different.
Wells SW526- on at 180 off at 174
Echlin FS147- on 194 ,off 203
Carquest TS148- on at 205 ,off 216
Borgwarner TFS54- on 234,off 245
Polaris 4010161-on 180, off 149
I wasn't comfortable with such variables & opted for the Polaris .
Hope this helps someone.
