turbo rebuilding

[K13 WJD]

right chaps....ive just bought a c20 let vauxhall turbo engine. its fitted with a kkk16 hybrid turbo ( larger compressor wheel/housing) now, its smoking like hell. im presuming i can rebuild it myself, but how do i determine which kit to buy ???? will the oilseals be the same as a std kkk16 ( presuming the shaft is the same dia ????)

any advice guys ????

p.s buying a new turbo isnt an option. its going in a corsa, and space is a huge issue. there's exactly 9mm between the turbo and the radiator !