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I removed 3 of these trim parts from a damaged passenger bedside on a 1961 F100 Unibody. The drivers side had matching holes but no trim parts. I replaced the damaged bedside and was going to drill holes to mount the trim parts and found the trim parts I took off the passenger side won't fit the driver side hole. I would have had to find 3 more of these but it's tough when you don't know what to look for. I did some google surfing and didn't see anything like it.
Might be time to weld up the holes on the driver side.
ALL of those are 'after market' parts. NOT factory. Many different companies made them and there is no reason why they would make them all identical.
Sorry.