Crepello replying to Nimbus!
No need to worry about the Prairie--my 56xx has 2 x Easi-shunts (short)--no problem fitting.
I've managed to fit all my coaches with Dapol buckeyes or Easi-shunts, but I've had to cut off either one or both 'horizontal pins' from the coupling shank, including on the recent newspapers BG. Locos and wagons seem to be no problem.
HTH
Parp, vroom!