I don't know what you mean by crop line screens but in general focusing screens are either compatible with the 1D series (named Ec-*) or the 5D Mrk II (Eg-*), I haven't seen any that are cross-compatible.
As above. I don't thing they cross fit.
But you could have a stock screen OS even the EgS screen etched with any lines you like. Companies like bright screen or Katz eye will do it for you.