It was probably manufactured by SCS Fridgette. Highly suggest you contact either David or Lonnie in the RV parts dept. at Lichtsinn Motors in Forest City, IA.
You can take your core to most any good radiator shop and they can make up a new core. When mine failed, local rad shops wanted $185 to make up new core. I ended up buying a new core directly from SCS for $102.
'07 Country Coach Allure 470 Siskiyou Summit #31578, Cummins ISL 425; 2014 Ford F150 toad; Air Force One Toad Brake.
Glen Allen, VA; Smith Mountain Lake, VA.