| Casters are pretty available at hardware stores. Here's what I'd do:
Measure the socket as best you can, then check Home Depot. If they have casters that seem to be the right size, buy ONE and see if it fits. If it fits, go buy another three.
If the hardware store has several that seem around the right size, buy one of each, find the right one, then return the others and buy three more of the correctly sized caster.
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Bury me with my Fender P
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