They are accessible from inside the cab. Those rectangular nuts in your photo are welded/staked to the inner fender. They don't appear to be spinning or loose in your photo, though. If you can, you might consider snapping the heads off them, and deal with the weld-on nuts and remnants of the bolts once the inner fender is off. Replacement weld nuts are available from McMaster-Carr or other suppliers.


Kevin
1951 Chevy 3100 work truck
Follow this saga in Project Journal
Photos
1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.