if you have to change your valve clearences you may aswell keep all the existing shims and have all the valves retipped as the shims a a total bitch to find
the only ones i could find in qld that would fit were old pugeot shims and they are rare toyota dont sell them and no one keeps them in stock. otherwise i got quoted $35 each for a custom thickness shim. but if you get a new cam and all the valve clearences arent big enough you can take the shims to be ground down.