The rear door handle is the same on 1948/1955 it is a flip doen handle. It is similar to the 1948/51 truck door handle by shape, but the shaft and bezel is different. Modification to the truck door handle is possible, but it is better to find an original rear door handle and have it chromed.

George
1948 CE, 1949 CE, 1950 Suburban, (2) 1951 Suburban, unknown (AD) CE, 1948 GMC Suburban