I agree with Doremus the Pacemaker boards are easy to file. They are available new from Heavystar on ebay at very reasonable prices.

The 203mm Ektars are nice lenses, in the UK we are lucky as the ones made here (mount 370) are #0 shutter compatible ansd came in Epsilon, Prontor SVS or Compur shutters depending on when they were made.

Ian