From what I recall, the 360-1 rockers are the same as the 440-1 rockers.
Different spacers and shafts.
The exhaust rockers are the same as the intake/exhaust rockers for stock or SR heads.

If Indy doesn’t have any, I’d think with some hunting you could find some used spares....... but I’d look at that broken one as a sign of things to come.