Suburban and Panel truck mounts are the same. Check photo
Driver's side frame rail.
Pic 1, Body mount drawing, 5 total mounts, left to right, no pic for mount #1 and #5
Pic 2, 2nd mount looking forward
Pic 3, 3rd mount looking rearward
Pic 4, 4th mount looking forward
Both rails same.

Check attached

xfiles
Attachments
1954 Chevy 3100 panel truck body to frame mounts 2.jpg (291.79 KB, 445 downloads)
54 3100 panel body mounts 012.JPG (227.83 KB, 425 downloads)
54 3100 panel body mounts 008.JPG (235.63 KB, 407 downloads)
54 3100 panel body mounts 004.JPG (230.64 KB, 397 downloads)

1954 Chevrolet 3105 Deluxe Panel Truck
w/Factory HYDRA-MATIC