Help with P/Ns for Rear LCA Ball Joints

[ThisIsSparTTa]

Having some trouble figuring this out, and getting lots of conflicting information.
Based on some TT.net replies by Bernie, a trusted member, I grabbed some Moog K9820 ball joints for my rear lower control arms.

Suspension shop didn't replace them, because he said they are different size. I can't remember which way the numbers went, but he used a caliper and one part was 36mm and the other was 40mm.

I'm working on what used to be an NA. Courtesy Nissan says there is only one P/N for TT/NA rear LCA, but then CZP has a NA OEM LCA and a TT OEM LCA for sale. I can't find anything else saying the arms should be different.

So, what's the deal? Are TT/NA Rear LCA's different? Does that change the ball joint size?

Or is there a different P/N I should be looking for? I've seen a couple of references to a 9633 P/N. Mine are pretty shot, but now have new ES bushings in them, so would rather just replace the ball joint.

Thread1:http://www.twinturbo.net/nissan/300zx/f ... eeded.html
Thread2: http://www.twinturbo.net/nissan/300zx/f ... K9820.html
Courtesy Nissan - 1 LCA P/N: http://www.courtesyparts.com/300zx-part ... 6_980.html
CZP - NA P/N: https://conceptzperformance.com/Cart/de ... hp?II=5814
CZP - TT P/N: https://conceptzperformance.com/Cart/de ... hp?II=4918

[ThisIsSparTTa]

Coz replied, didn't mention if there were differences. Said some people used the 9819 from the front on the rears too, but this doesn't seem right either. Ordered the 9633 since some people seem to think that will work. At least they're only $12/ea from Amazon