

I ordered my Fan Belts from GPR Industrial and couldn't be any happier, they sent my order out to me right away! Good quality, great price! I got correct size belts, and shipping was reasonable too.
I needed to buy some off-size alternate length fan belts. After using a rope and colored tape I was able to take measurements of my classic car fan belt sizes. Because of the work I did on this engine, the configuration of the pullies had changed, so I had no real "go-to" belt numbers anymore. Using a rope of the same diameter as the pullies, I set out to find an accurate length fan belt for each accessory, in which I was successful. I made sure the accessories
(AC compressor, Alternator, and Power Steering Pump) were set at the half-way point in the adjustment grooves. I then, wrapped the rope ("line" for you navy guys) around the pullies, and taped a marker at the place where the ends of the rope met (intersected). I then took out my tape measure and holding the end of the rope up, let it hang, pulled the rope taunt, and took a reading. I followed this procedure several times for each belt groove. Then, when sure of my measurement, I wrote the numbers down. This gave me the fan belt lengths. I cross-checked the size on the internet cross-reference charts from different belt manufacturers and had the fan belt numbers I needed to make my order.
I discovered that Fan belt numbers are coded to tell the width and length.
The first digits tell the width
1500 belt = (3/8= Alternator) VS 1700 belt = (7/16-AC & PWR-STRG) I needed three fan belts in all.
the last digits are the length jumping in increments of "5" (00 to 95) in half inch increments I think.