fender trimming?

[driverdave]

I trimmed the front and back of my fenders, problem I am running into is the inner fender well, I trimmed both ends but the door end between the fender and inner fender wall there is a big gap looking at it it runs to the back end of the cab.

Any ideas on how to fill this hole? last thing I need after the rot fight is to cause more rust/rot to happen.

atm I hacked the inner well and it kind of fits but not a good fit.

[TrailReadyMJ]

I just leave mine open and spray it out when washing.

I have heard of folks using, of all things, pool noodles. I take it they fold up and fill in the gap well.

Personally, I like the idea of being able to wash it out versus using something that will trap moisture.