plastic end step inserts for a rear ladder on a 2004 DSDP

I replaced my end cap black plastic inserts a few years ago at a cost of $1.95/ea. The part is called a (Blk. Premier end cap w/ screws). I ordered them from the manufacturer directly.
ATWOOD MOBILE PRODUCTS LLC.
1120 N. Main St.
Elkart, In. 46514
(574) 264-2131 or (800) 546-8759
The company who made the ladder had just been purchased when I bought mine. I have one other number (574) 262-9399.
Good luck, I think the repacement caps are still available.