my ex does, my friends dx does and his brothers lx does.

as far as bushings rui,
i used the prothane ones, forget which ones but they are the size of a siver dollar and are about 1/2" thick, i got a gsr rear sway so i dont know if you need them. the gsr mounting plates are offset from the sub frame so you need bushings if you got a gsr mounting plate.

yours looks like its flat but its from the back view.