Both can be rebuilt. Any alternator place can do the alternator. Rock Auto in the US sell replacement pumps, too, and might sell a rebuild kit as I bought one for my UCF20 from them.
https://www.rockauto.com/en/catalog/lexus,1990,ls400,4.0l+v8,1187456,steering,power+steering+pump,7380
It would be cheaper to import a UCF10 Celsior with working air suspension than buying the lot from Toyota.