Thanks. I think it was Home Depot. I ordered and they sent via mail. I did have to paint as it was white. Tried to find receipt but no luck. I'm sure there are multiple places to order, and I noticed here a couple HD's actually keep in stock, maybe even Amazon. Here's an example but again, I don't remember exact size and RV is 20 miles away. Thx, Dennis.
https://www.homedepot.com/p/6-in-x-7...67-1/300082125