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Appears that the only available slave cylinder is GM. Autozone has a part number but shows as unavailable, Raybestos has a part number but is on National back order.
GM DID have a supplier that had problems with the tolerances. GM has a new vendor for the slave. All old stock should be pulled by now. If you get a new GM one for replacement make sure there is no yellow or orange dot in the slave itself.
If you have replaced several slaves and paid for more than one send me an email, I have some more info for you.