The part number you provided in the photo did not bring up any parts on my end, but if you already have electric brakes and you are just replacing the passenger side brake assembly then you will likely be able to use Electric Trailer Brake Assembly - Self-Adjusting - 10" - Right Hand - 3,500 lbs # AKEBRK-35R-SA. This is commonly used on Forest River R-Pod 172 travel trailers like yours and this 10" brake is compatible with 13", 14", and 15" wheels.
Then if you need a new hub and drum... view full answer...