I cannot help you with the sizing, sorry.
I do agree with you about shopping local, but on the other hand I don't see my local RV suppliers supporting this forum.
I will distribute my costs between the contributing suppliers here first, it will cost me a bit more, with exchange rates and shipping but I can accept that, and my local stores will mostly be used for the purchase of tools.
A wise man once told me he wanted to stay fit enough to run a marathon on his hundredth birthday. Another said he wanted to be shot by a jealous husband on his, I'm with the latter. God bless you Richard.
Carpet Cleaning is what I do, it's not who I am.