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Rusty, thanks for the response. I just checked the hole size in the bar, and a 13/64 drill is the largest that will pass through it, so I'm sure it's a 3/16 rivet. The holes in the cowl post are larger (over 1/4"), but being relatively thin metal compared to the bar, they're probably worn larger from decades of body flex. I'll probably weld them up and redrill to 3/16.
Bob