The part# for the v-belt on your site is 966978...I got a new # somewhere of 966382 so don't know if it goes by that 3 also, anyway my question is....Is this a "double" belt kit or do I buy 2 of these?I have the double belt alternator pulley on my TAMD41A,

The alternator belt kit contains 2 belts with a number 966978. The 966382 is single alternator belt that was originally specified for a TAMD22A engine. So the 966978 kit is made up of two 966382 belts. So you can purchase two 966382 belts ($26.12 each) or one belt kit 966978 ($59.29 kit).