The back face of my pulley sits ~1.65mm (.065in) away from the alternator. I'm not sure if that is the exact thickness washer you would need, but at least you can use that to find a washer of the correct thickness at a hardware store. You'll have to measure the shaft to figure out what ID washer you'll need.
I'm pretty sure most washers of this size will be ~.063in thick so that should do you just fine.
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