Hi

I you standardize on 39mm ilters and the clip over Leitz hood {or generic (clone) 39mm screw in hood,} you can use the Summaron 35mm /2.8, Summicorn, (or late Elmar) 5cm /2, and Elmar/Elmarit 9cm. I'd recommend using a tighter (i.e. optimum) hood for a 9cm lenses.

You need to be careful to get the correct version of the Summaron or Elmar

Noel