Nun, try Bader.
Stephen Bader & Co., Inc. - Manufacturer of quality belt grinders, polishing and finishing equipment
I think you mean a 2 x 132 inch belt. These also come in 3 inches wide and Bader makes a very nice size grinder so they have the belts too. Sometimes MSC or ENCO will get long belts like that.
A long belt has more time to cool down on the revolution. When the belt gets hot the glue holding the abrasive on the belt loses its abrasive stuff quicker. Plus the big units have more HP on the motor and you get more material removed.