I'm not familiar with these specific kits, but they look to be very similar to the narrowgage cars I build. We use 714 couplers in HOn3. For standard gauge, the #4 was a similar form factor, but slightly different design. The package specifically states it's good for "wooden floor car kits" but should work just fine with similar plastic kits.
Unforetunately , Kadee seems to no longer be making the #4, but they should be easy enough to find.
The #15 Logging Car Couplers have a similar low profile draft gear and may also work. They have a plastic draft gear versus the metal draft gear in the #4. They are also discontinued, but will also work for you if you can find some.
Mike Lehman
Urbana, IL
Does anyone know what type of kadee couplers to use on funaro & camerlengo coach and combine kits, including the boonton and stillwell coaches?