Hi Matt, sorry to hear about your troubles and the broken corner seal.  Was it the "solid" type or the one with a rubber insert?
I went the solid type from Atkins Rotary on my last rebuild.  https://www.atkinsrotary.com/store/86-95-Rx7-2mm-Solid-Corner-Seal-Set-ARE88.html
Jeff

Corner seal broke in two. Rotor housing looks good, apex seals look good, but front rotor is toast. I could of been flying a few years ago, if I didn't go down this Rotary path....

- Matt Boiteau