Pivot lock shoe

I have several pivot lock shoes that the cams are broken rendering the lock shoe useless. I?m looking to either replace the shoe or the cams (if that is possible). The problem I?m having is finding the shoe online. I have measured the shoe(s) as
1 1/2?H x 1 1/4? wide x 17/32? depth. The balance spring is Unique 27-C-30 (28? long) with a hook at the end of nylon string that attaches to the shoe.