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I don't know 58s, but 61-71 trucks have a tag on the door pillar and a stamping on the frame. The frame is stamped on the passenger side in the front wheelwell area, usually above the axle or aloser to the bumper. The Canadian trucks are stamped on the driver side closer to the rear axle. The numbers aren't very deep and may require cleaning/scraping.



Hey Guys...found it!! There was a tag in the glove box that we thought may have been correct...It showed the vin and axle ratings etc.
Went looking on the frame some more and found the same numbers stamped on the left side frame rail about a foot ahead of the left rear spring hanger.
Thanks again fellas!!