F40 IHI Turbos Rebuild?

I ran across some original p/n (not the "updated" p/n) F40 turbos for sale that have been rebuilt by a previous F40 owner (at a turbo shop). His turbo seals blew so he installed new turbos and rebuilt the old ones but never reinstalled them.

Can the IHI turbos be rebuilt when the seals blow? A couple of people on the board, including Roland, have said no – but no specifics.

http://www.ferrarichat.com/forum/showthread.php?t=68868&highlight=F40+IHI

I see a variety of IHI seal rebuild kits on the market. What can’t be rebuilt on an F40 turbo? Why?

I assume it may have something to do with the early turbo using bushings instead of roller bearings?

Any info would be appreciated. I was going to pick up the rebuilt IHIs for stock given a very good price, but don’t want to pick up junk.

Thanks,

Tim