Hi, Looking for some advice - tried ordering a fan clutch thru NAPA for my 289 A code...Thermal clutch and the shaft is too long. I do have factory A/C should I be using Non-thermal? And/or does it matter? I do not have an extension on my currect set up! Either or...as long as you do not run hot? Should I order thru Dallas or CJ Mustang? - they only seem to carry Non-thermal... Appreciate any advise...recommendations!