I have GT3cup lower control arms. I have no idea how they are different except like you say the bushings. I hope they are also beefier - I bent a front wheel on the track after i had these installs and they didn't crack or bend.

Part #: 997-341-041-9M

The shop also informed me i need new trailing arms for this the part number is:

Part #: 996-341-043-06

I was charged $600 for the LCA (EACH!) and $228 for the trailing arms.

I don't even kniw what a trailing arm is (is it like a tie-rod at the rear for adjusting toe??). But the shop is a reputable one, albeit i do add a fair amount to their profits i'm sure.