I have a '59 and did a couple of things that may help you.
I made a shelf by making a paper pattern in the shape of the cab just above the gas tank. Once the pattern is done I used cabinet grade particle board for the shelf and attached rubber tool box liner to the edge for cushioning, then the shelf needs something to rest on. So I fabricated speaker boxes for each side and screwed the shelf to them. This shelf now holds; a jack, CD player, a spray bottle for window washer fluid, and a towel.
Then I made steel blocks to go under the seat mounts which raised the seat (more leg room too) and allowed it to go back just a bit further and I could adjust the recline closer to the window (or cab shell).
Now I can't really see the shelf or tank at all.
I'll post some pictures soon, don't have any now.
