Mitsubishi BD2F cutting eges

Looking for replacement cutting edges for a Mitsubishi BD2F dozer. Mitsubishi lists the parts as follows:
58021-00700 BIT, end, L.H.
58582-10300 EDGE, cutting
58021-00800 BIT, end, R.H.

I've contacted Rhine Equipment and they no longer service parts for Mitsubishi dozers. Any help appreciated!

Mitsubishi BD2F cutting eges