There's some good and some bad news on that search!
I may have found the item but then I also find there are three different "issues/ builds" of that year and model of Vista!
So there are two ways to go before committing to having the correct part number.
I use this interactive parts setup:
https://catalog3d.winnebagoind.com/menu/Parts.htm
That gives me these choices of model for that year:
I find this info on the first model on the list! I did a check of the others and this specific part did not seem to change for this year and models!
Click this snip to get a better view to read the part number!
IF I am correct in looking for the right part as I read it AND your RV has the first serial number on the list, we can say for pretty sure this part number is correct!
That's the good news if I'm guessing right! But assume I'm wrong, so verify before trusting!
If you need to check other models follow this set of links:
https://catalog3d.winnebagoind.com/menu/Parts.htm
Choose correct modle number and move to that set!
Move to interior, then interior trim and decor section.
Clicking on the right item will then highlight it on the parts list at right!
See if that gets you where you need and let me know if Any hionts needed on working the interactive controls as they are a bit of "learning curve" where I might save you some time, if you get stuck!