I guess every Ross drive is unique, but mine was a custom ALU plate with the starter ring gear crimped on. The ALU plate bolted onto the counter weight. The clutch/dampener with the splice bolted onto the ALU plate with  8 or 10 allan 8mm screws/bolts and 1/2" (?) ALU spacers.

So all you need is the standard counter weight. I believe the hole pattern in the counter weight is the same for auto and manual.

Finn

Paul wrote:

OK....I am going to openly display my ignorance here....I had my Ross PSRU off only one time, when I had the thrust bearing mod done.  I simply reinstalled it opposite of how I took it off. That was some time ago, and I can't recall what it looked like where it mated to the flywheel.  Did the Ross also use an auto flex plate?  I remember the shaft was splined. That's about all I recall.  I am asking this, because I have purchased a set of street ported 4-port plates to which I will add a set of NA rotors and housings to build up a complete engine so I will lessen my "downtime" by hopefully swapping engines on a weekend. I would like to have this new engine ready to bolt on and run. I'm assuming  that  the stock, cast iron flywheel I have if from a standard transmission RX7. Are the automatic and standard flywheels different, or do you just add an automatic transmission flex plate to the cast iron flywheel I already have?  Just when I thought I had everything figured out, I start reading new posts about flex plates....

     Thanks in advance for any and all replies/suggestions.  Paul, what the heck is a flexplate, Conner