> I was looking at using two of the third gen
> coolers I think John Slade is running them
Yes. They're about 10 * 6 * 1.5. The '93 + RX7 has two very similar coolers,
one for the oil and one for the transmission. I think the transmission
cooler is about 1/4 inch  smaller. I used both for oil. Oil cooling seems to
be fine.
Regards,
John Slade