I would call DL Trailer and ask if they can get the Nev-r-adjust brake assemblies. And FWIW, I took my Lippert axle brakes from my Zinger and installed them on my Forest River cargo trailer with a Dexter drop axle. Both 3500 lb as bolt patterns for brake mounts are the same. Of course, axle has to have that mounting flange on it. Not the self adjusting ones though.
Good luck in your search. If the border opens up, ship E Trailer parts to border and pick up there. Iíve done it many times. Either at Lancaster Mn on 59 or Pembina on 75.
2013 Zinger ZT260BH towed by a 2013 Silverado Z71 1500 CC 5.3L