If you have an NX, and you want a rear strut brace - check out the following link on the sr20deforum board:
www.sr20deforum.com/showthread.php?threadid=20075
jlequipment will MAKE these if atleast three (3) people are interested. I have put myselfy on the least, so there only needs to be 2 more of us.
I have wanted one of these since I bought my NX, and it is an inexpensive way to tighten up the rear of the car.
As far as I know, there are no other ones in production, Motivational had a batch, but as far as I know they have no more.
If you are interested, contact jlequipment on the other board, and/or post a message there. Thanks.