New early 12a parts available here:
 

I was perusing Craigslist today, and came across this:

Original stock MAZDA RX-2 motor parts. Not RX-7 parts. Early 12A parts. No longer available.

NEW PARTS: Front end plate, middle plate(will need light surfacing, storage scratches)

USED PARTS: Factory lightened eccentric shaft(very rare), rear plate, 2 rotor housings, 2 rotors.

Holley 4bbl. carb/alum. manifold/air cleaner, stock oil line, box of points for dual distributor(10). E-Mail for more photos.

Buyer pays all shipping/handling.

Link: http://detroit.craigslist.org/okl/pts/1747867842.html

FYI: I have no affiliation with the seller.