66 headlight bucket attachments

[Chevystep]

A couple of picts of the headlight bucket/holder/adjuster into the grill, near as I can remember, these were held in with 4 rivets. Assembly manual has a rivet holding this together. Seems like these being in there firm is imperative as this is the main attachment point for the grill to the front fascia behind it, would bolts and washers be a better idea than a good steel pop rivet?I doubt I'll use a blind rivet and peen it over....