Once again I assumed I was right and the world was wrong. I decided to remove the A/C from my 89 LX. I saw advertisements for A/C eliminators in catalogs, nah why spend $85 bucks when you can just buy a smaller belt and the little diagram near my radiator showed the serpentine with and without the A/C. The belt recommended for a non-A/C Mustang was listed as a K060845 so I went and bought one, NOPE! way to small. So I got string and measured the serpentine at 86.4 inches, still to small. I went back and forth to the auto parts store and finally narrowed it down to one belt and it fit, BUT the clearance between the belt on the top and the water pump was about 3/32", to close for comfort. I tucked my tail between my legs went back to the auto parts store, admitted defeat and gave them money for coffee and doughnuts for putting up with me for 2 days. My A/C eliminator kit will arrive in three days. If any of you are inclined to try what I did, don't. If you insist the best belt for the task is a K060870, but don't say I didn't warn you.