this may be a stupid question but nobody seems to be giving me an answer.I have a rwd g37 sedan. I want to purchase this maxspeeding rods kit for the awd model. JUST FOR THE REAR TRUE COILS
https://www.ebay.com/itm/175681274343?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=iHgfRDTKQhq&sssrc=2349624&ssuid=mpy2t-xzt9-&var=&widget_ver=artemis&media=COPY

Will just the REAR fit the rwd car? I have Bc coilovers no true and want to replace just the back.

 

I have BC coliovers all around my G37X sedan, although obviously the rears are not true coilovers. I'm pretty happy with them.
What's the advantage of a true coilover vs the arrangement in the Infiniti rear suspension?
I certainly would not replace BCs with the Maxspeedingrods coilovers you linked.
Also, I would not add the load of the spring to a shock tower that's not designed for both the damper and the spring force.
This is the reason I haven't replaced the fiberglass transverse springs in my C5 Z06.

 

Rears are the same. Only the fronts are different because they have to clear the front axles for AWD.