bearings and ARP bolts rocket industries are your best bet, they had them in stock last time i checked.
injectors can come from a 7mgte just get the injector plugs to go with it.
gasket maybe one of the traders here, otherwise i would recommend a cometic headgasket (ive use 2 [long story about that dont ask] and mate uses one in his 240rwkw 20v turbo) again available from rocket industries.
arias you could order from their website or arias distributor. have you tried they are the distributors for WISECO pistons and should have a factory replacement piston right up to custom 13:1.
other stuff no idea sorry.