I don't have my structural repair manual handy with me right now, as I'm sitting at gate A8 in Memphis waiting for a connecting flight to St Louis, but I believe that those rivets are monel.
Just because monel rivets are difficult to shoot, I think that if that were my plane, I would order monel cherrymax's from Spruce. Go for the oversize ones as the holes are likely to be elongated at this time anyway. The grip length is probably a -1 or -2, but check it anyway to be sure.
When drilling out the old ones, it would be best if you could use a drill bit lube like Boelube to keep the bits from wearing out too soon. Don't let the old rivets spin in the holes as this will wear out the rivet hole.
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