Thanks, Dillon. Exactly the info I was looking for. I figured it was an early model issue.
As PD says, I’ll just fab up a footrest bracket, now that I see how it’s “supposed” to be. And if it turns out the side cover rattles with just two bolts, I’ll deal with that the same way.
Oh, I forgot to mention, on the footrest I bought, the notch for the choke lever is on the wrong (left) side. No biggie, I had to cut another on the right. Has any Vespa ever had the choke lever on the left?