the pulleys are similar to modern standard ones, ie, with a 5mm hole for 5x.8mm mounting screw. Buy a pair of basic stock pulleys anywhere, or scavanve a pair from a dear derailleur in a junk box. Note that you'll probably need to replace the pair, since even though the inner hole is the same, the overall width may not be. If your new pulleys are much narrower, either add washers to take up the width, or file off the bit of mounting bolt extending through the cage.
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