I can also help out here as I have the complete R.H.D Genuine Mazda EPC (Electronic Parts Catalog) for Mazda cars and Trucks sold in the UK and Australia from 1985 on wards.
I also have some are PDF Parts books on the RX-3, Cosmo and a few other rotaries.
So if you want genuine part numbers I can help.
You must tell us what Year and or Model Mazda (i.e. RX-7 or RX-8 or 626 or 323 or Mazda 2,3,5,6) you are talking about...
In most cases a Chassis or VIN number will reveal everything, that is the JM_ _ _ _ _ _
one., or the S124A_ _ _ _ _ _ .., LA23S_ _ _ _ _, or CB2MS_ _ _ _ _ .