who can help me with race rear A arm?

[topspeed.ua]

Hello. My car is a drag R32 gtr. it goes 8.164 1/4 mile.
Right now all of my front and rear controll arms but the rear ones are aftermarket and have metal ball joints in place of rubber bushings. but the A arm (rear lower triangle arm) is stock. I wanted to get some aftermarket A arm that will have metal ball joints, or ball joints insets into my stock A arm. can anyone help me with this?

And another question, the rear subframe of R32 vs R33 have one difference in front mounting point of the A arm. the r32 have the front mount higher then the 33 and I know many drag cars have replaced the subframe or changed front mounting point. does anyone knows anythgin about this thing?

[Sub Boy]

You could use the Driftworx or Ikeya arms.
The R32 GTR shares its rear arms with all of the R32 models, so just look for R32 Skyline models