front cab corner inspection hole?
#2
The "inspection hole" is actually an access hole for the installation of the bottom-most bolt between cowl and fender. There is a triangular-shaped cover that goes over them and attaches with 4 screws. The covers are available from Mid Fifty for $16.50/pair. They are flat, so you could also make some out of 16 gage (.062) thick sheet metal.
If you don't cover the area, it will just collect a lot of mud and rust out again.
If you don't cover the area, it will just collect a lot of mud and rust out again.