Fenton Wells sent a summary of his HO scale plastic reefer kit upgrades. Here’s Fenton with the details.

The Accurail 8500 series kits are very nice, plastic injected-molded models of plug (sliding) door transition era, 40-foot refrigerator cars with ice bunkers. I model 1953 and found the prototypes were first introduced around 1950. I thought I should have one or two for my railroad.