This topic is interesting because I learned something.

#1. 47-55 1st Panel and Suburban L/R rear back doors are the same. Group # 16.160

#2. There is a different Door Stop/Check for Panel and Suburban. Group 16.430
.....47-55 1st Panel
.....50-55 1st Suburban (I believe in 1950 rear back doors were offered for the AD Suburban)

#3
. 47-57 Panel rubber Bumper for the Stop/Check is listed under
.....Group # 16.437 Pin Door Check Link,
.....47-57 BUMPER, rear door check, part # 371890
.....Only in the 1929-1957 Chevrolet Master Parts & Accessories Catalog

Additional pictures:
1954 shop manual Panel Bodies
Page 1
Page 2

MNSmith, 1951 Chevy Suburban Door Stop/Check pictures
Door Stop/Check 1
Door Stop/Check 2

It is interesting that they made two types of Door Stops/Checks for Panel and Suburban.
I am not sure if the mounting holes are the same though.

Thanks for the Education.