This is the one that worked on my '18 Anthem:
https://www.amequipment.com/shop/230...67-mhpm3-y2lm9 (214-1001, no pinion, no mouting screws).
Available from many sources. When I was shopping, the link I provided was the best price ($64.30 in June of 2020) that I found.
Free advice:
NEVER step on the step while it's moving.
Take care,
Stu