There's a couple on ebay mate. Or try Hayward rotary, or any of the other rx specialists. Make sure they're not N/A housings though as they are different.
i may have one housing and a rotor others are mashed ill get back to you they are laying in the mazda garage i served my apprenticeship at
cheers guys ! total loss of compression at 9000rpm so exspecting alot of damage but il have it in bits tomorow so ill know for sure