the whole kit will come with bearing seal rings and all associated clips 'o'rings and fastenings,
its very easy to do the kits, just remeber how it comes apart, this is very important as you will forget when youve got it all in bits, the seals as you call then , one on the back near teh exhaust wheel , there like a small piston ring , be careful when fitting as they will stretch, apply plenty of oil and gently press the shaft back into the core one you replaced the bearings which are held in by small circlips. iirc the front of teh T2 has a small plated front seal which is compressed on when the comp wheel is fitted , all very straight forward once youve done a few !!
good luck , all you need is a clean surface - is a must as any shit will fook the thrust in no time , lay everthing down in order !
enjoy !!