18WheeledDemon
Newbie
The two I bought are completely identical in every way. They we're not from the same year of truck. Direct swapActually they are not all interchangeable. They do vary depending on the brake RPO codes and GVWR that the truck has. There are 4 unique combination valves on the C/K trucks. The BPMV is different - I think 2 different types. The EBCM is different. There are 6 different EBCMs that could be equipped based on the trucks configuration. There’s no way to tell which EBCM or BPMV a truck has based on visual inspection alone. They all look the same.