They're the same shoes used with regular brakes. Any good local parts store should be able to order them, or you can go online to places like Rockauto.com. Or, our host here will sell you a set:
https://secure.amesperf.com/qilan/Se...sub_rowid=1098
I have Raysbestos organic shoes on my car, Rock Auto has them listed here:
https://www.rockauto.com/en/catalog/...rake+shoe,1688