Levin twin pots, corolla single pot carriers, 1.8vvti mr2/mrs disks.. No spacers and no machining of disks. Just a slight filing of the actual caliper which is needed for any of the other combinations as well ;)
They are all different.. Td04 then you have different letters relating to differences in exhaust housing and then numbers that relate to compressor wheel and then a final letter to do with compressor housing. I might have that all wrong but that's the general idea. Basically you could be fitting a smaller turbo with a bigger exhaust side that's going to cause more lag with less power, the opposite or any of the above combinations..
If your going to buy a new flywheel you might as well buy a lightened one. If your talking about using a second hand one if it hasn't been skimmed then your still in the same boat
But if you think about it your going to get to a point where everything is new and you wont have to worry about anything going wrong for another 50-60k miles