FredB,

1950 GMC - right?

Check any of the parts vendors for running board step plates. I do not think the AD running boards had rubber mats as were found on many older car/truck running boards. American Classic has an after market GMC plate and an original style safety tread plates.

http://www.americanclassic.com/asp/...&iyear=1950&ytype=to&exyear=

Has anyone installed the original-style plates? There is no pattern for marking the holes. How did you locate the holes?

Thanks,
Tim