The easiest way is to find a pair of beat up fenders and cut two inchs off the inside,bolt these to your bed and weld your fenders to them.
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Floyd

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Floyd

If we choose being kind over being right,we will
be right every time.
Knowledge is a poor substitute for experience.
Remember what is precious to another, may not be to you, but it
is precious nonetheless.

1948 Chevy 2-Ton