I will outline what we are talking about.
There are four coolant sealing O-rings per rotor housing. 
Two outer and two inner.
There are also four oil sealing O-rings per rotor. Two on each side of
the rotor proper. These are located on the flanks of the rotor. 
Two per side.

Teflon encapsulated silicone O-rings are the best there is for this
application. Teflon is about the most inert material you can
find and it is resistant to most known chemicals. Unfortunately
it is not rubber like and that is where the high temp silicone 
rubber core comes into play.
 
http://www.creavey.com/

> 1.  Inner coolant oring - 
>     
>     circumference  = 28.625
>     diameter       =  9.111
>     slot depth     =  0.062
>     slot width     =  0.141
>     section size   =  0.103

> 2.  outer coolant oring - 
>     
>     diameter       = 11.340
>     slot depth     =  0.062
>     slot width     =  0.110
>     section size   =  0.093
  
This is critical! The proper section size is .093. Not 3/32
as a 3/32 O-ring is bigger in section size than .093.

The TES O-rings are stiffer than the stock O-rings. It is harder
to get them to lie in the groove. Even with Vaseline.  When you buy
them they don't come flat. I found that using a plywood
form to pre set the slightly under size TES  O-rings for a few 
days  works well. Here is a picture.


--------------------------------------------------------------
Oil O-rings.

I checked the installation of the oil O-rings with the new
sizes I got from Creavey. They worked perfectly and were
very easy to install. You will need a little O-ring lube
and a 2 by 8 to install them. They were also easy to remove
with no signs of distortion.

One of the secrets is if you reuse the old oil scraper rings
they must be spotlessly clean inside and out. Soak them
in carb cleaner for a few days. If you use new scraper rings
this will not be a problem of course.
The second thing to watch out for is don't nick the
rotor wall between the two scraper rings when you remove them.
Very very important!!



These can be the same or just a little more than the 
stock oil O-rings from Mazda.

The proper oil O-ring sizes are:

0.093" section 4.68 inch ID
0.118" section 4.33 inch ID

I can vouch for the quality of the Creavey O-rings but some
of those water TES o-rings from Mcmaster Carr I have seen
are not as good. This is not to say they won't work. They just
don't look as good around the joints as Creavey O-rings.

Viton is good only to 400 degrees F. The center of the rotor runs
as high as 500 degrees F. I think 400 degrees F leaves's too
little of a safety margin when 500 degrees F is available
in TES O-rings at the same price probably.