Happy Spring!! Look at all the hi-jacks!!!
@JackRabbit & jdog79..Welcome aboard. hijacking threads is typically frowned upon. The OP is asking about how to replace. You're jumping in with "Where to Find".
In the future please consider starting a new thread.
The MAxum OEM for ladders is typically "Windline" (mmwjr got hit with a weird spellcheck issue).
You will need to determine the type of ladder first. (e.g Under Platform; Over PLarform; or Slide Ladders).
A number of chandleries will sell this brand.