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x2 I found that most of the Gen3 brake part assemblies are no longer available from Toyota, but their rebuild kits are (and for brakes I'd only use OEM parts). The master cylinder rebuild kit is cheap, comes with all of the wear parts and it is super easy to do. The only special tool you need is a snap ring plier. When you buy the master cylinder rebuild kit also get a pair of the little grommets for where the reservoir connects to the master cylinder, and a gasket for between the master and the brake booster (you do not have to remove the booster, or anything from inside the vehicle, simply working under the hood unbolt the brake lines and the cylinder from the booster).
Get some lithium based glycol grease (if you buy a caliper rebuild kit it comes with a little ketchup package of it, or buy a tube from the dealer or auto parts store, the Toyota stuff is translucent pink color).
Lube up the bore, and the seals with it and reassemble. If the bore is corroded you can hone it with a auto parts store brake cylinder hone.
Just did this last week, to my '93.