E-trailer would be a good place to do research. You may have a number on the old assembly that you can use or cross reference. Otherwise, measure the shoe / drum diameter and pad width. I’ve seen the drum have the specs you need as well. I have replaced several brake backing plates on my ‘89 Excella and ‘02 Classic. I was able to get self-adjusting assemblies for these trailers. I would certainly ask if this type of assembly is available for your rig. It is worth a few $$$ extra for the convenience. I bought 12” x 2” self adjusting assemblies for $50 - $60 each as spares. You need lefts and rights.
Dan
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