I realize they aren't exactly plentiful, but I'm thinking he'll likely take anything you might have. Anyone help out a fellow Laurentian guy?

I'm not sure about his image, but I think he'll need a 64-65 Bisc/Bel, Strat, Laurentian wheel and ring as he's pictured a 65 Parisienne setup. The Strato, Laurentian cap will not work on this assembly.

https://www.kijiji.ca/v-other-auto-parts-and-accessories/moncton/wanted-horn-ring-center-cap-for-a-1965-pontiac-laurentian/1623160886