Michael, that part number didn't come back to anything but we do have a few replacement ladder options for you to check out.
Depending on how tall you need the ladder to be, something like the Stromberg Carlson Exterior RV Ladder # LA-401BA could work great.
This ladder measures 99-1/2 tall x 12" wide, has a 250 lb weight capacity, and has a bolt on install using the included hardware. view full answer...