I had to modify the tractor to accomodate the filter cart, magnets, and thermometer. The magnets are shown in more detail at: Tank Magnets
The existing tank before and after cleaning can be seen at Tank Cleaning
Here is a CAD drawing of the tank, cover, and modifications:
Here is the top of the cover part way through modification:
And the other side:
After installation – right side:
And left side:
