Two possible solutions; the first I've implemented. I trimmed a cap off an Ice Mountain gallon container - see Photo Bucket pics, along with one pic for the extra hole under the gas tank. I think that one came off a 5 gallon HDepot paint container - no trimming required! Add a touch of caulk to the rim and you're good to go. I'm still working on getting part numbers for correct size rubber plugs used in several places on my brother's Mustang - designed just for weather sealing access holes in the body. I know they make them - just have to get the part numbers. But given the location on my 41 and the frequency of need to access, can't beat this freebie application. Hope this link works - not my strong suite!

http://s767.photobucket.com/user/jtfarm1/library/Josh%201941?sort=3&page=1

Last edited by Farmone; 02/02/2014 9:03 PM.