There was someone on BikeForums that was recovering Brooks Saddles. But, I've lost the thread.

I've seen rivets sold on E-Bay, but they appear to be sold EACH????

Tandy Leather seems to have them in 50 packs or so, which should work. Wow, I hadn't seen Tandy for quite some time.

https://www.tandyleather.com/en/prod...r-rivets-burrs