What I often do Bill is if I have such variety in couplings is select one that has removable ones and put in a differing size one on one end of the same wagon. I believe a company in the UK called Replica Railways can for example supply larger NEM (swallow-tailed) couplings (which just pull out) for such a purpose.
I hope that's not too muddied!
I hope that's not too muddied!
