1mm is the stock head gasket thickness.
Bead and Stopper gaskets are 2 different kind of HKS head gaskets. Stopper is much better than the bead, cheapest HKS stopper head gasket I've seen is $355 and its 2mm's in thickness.
Don't even bother buying a head gasket until you have the cylinder head off of the block. Because that will be the only time you will be able to determine IF your cylinder head and block are in proper condition to be able to use a Metal head gasket. I wasn't able to use a metal head gasket because of the pitting around the exhaust side's coolant passages at the #6 cylinder, which is, by the way, the most common area for the supra to blow the head gasket.
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