I've searched but haven't been able to find info. I'm using a Corvette water pump, stock size Corvette crank shaft pulley, Corvette alternator bracket/alternator on a 5.3 with no power steering, no A/C. I'm looking for the serpentine belt size.

 

You will probably just have to measure. The a/c was a separate belt so the only thing you changed was no power steering.