1960s Rolex Expansion Rivet Bracelets

Hi All, I recently bought a couple Rolex riveted expansion oyster bracelets from the late 1960s/1970 made by C+I. A few of the springs are worn. I was wondering if anyone knows where replacement springs can be sourced (outside of the one seller from ebay) or if they can be easily made. I think the springs in the US made bracelets are the same design as the swiss bracelets.

Ideally, I would like to do a full restoration by grinding off the rivets, replacing the springs, and re-riveting the links. However, I have yet to find a source for these rivets. The Swiss bracelets have standard rivets, which can be easily replaced if removed. However, the US bracelets have hollow rivets. Any idea if these can still be purchased somewhere? Worst comes to worst, I will go the route of bending open the folded links, but don't love doing it.

Photos for reference below!