http://www.stangshiftergaskets.com/belt_selection_guide.htm
2.76 4 lb. 3-100mm
1-90mm 3.2" Tensioner not notched K080806
2.80 4 lb. 3-90mm
1-100mm 3.2" Lower idler in upper position K080810
.040 when it comes to the length of the belt don't mean shit. most people dont know how much that really is plus you have 2mm larger on a ideler which is .078 so your belt would be .038 to short if you use belt for the 2.8
buy the 080810 from NAPA put it on do not start the car. they will take it back. then order from
www.rockauto.com and pay half the price