Cannot find a belt?

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I'm trying to bypass my air pump on my 88 chevy 4x4. It's got a 350, power steering, and no air conditioning. The problem is I cannot find the right size belt. The belt needs to be 70-71 inches long and 4 rib. If I try buying a belt for and engine that didn't come with an air pump, the pulleys are placed a little different and its an 80 inch belt. I had another 88 2wd with the same setup, but I haven't a clue where the belt came from, so I know this has been done before. I've tried every part store and on the net, can anyone help me?

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anyone?