Depending on whose glass fenders you have, they likely would not fit your hole pattern anyhow. Might be best to fill in existing holes in bed sides and start fresh.
Stock rear axle location does not center wheel in wheel opening. Some guys relocate axle a little

Last edited by Britcon; 02/21/2016 8:57 PM. Reason: Added info

1940 Chevy KC 1/2-Ton
In the Stovebolt Gallery