Re: Belt number!
Yes, according to the Gates catalog, it makes a difference whether or not the accessories included A/C, even if it doesn't have A/C now.
Understand, I'm not looking at your truck /ubbthreads/images/graemlins/smile.gif But I've checked twice, in the cheap belts and the Gates, and they both list those lengths for "with A/C" and "without A/C" for a belt that is called out specifically:
"Belt - Alternator & Vacuum Pump"
Doesn't mean it's right, only that that's the only resource I have available.