Rear Upper and lower cont.arm bushings???

[Draginmadd]

i have Mac upper and lower control arms and the bushings are starting to fail.
do stock type bushings work or do i have to get them from Mac????
there great control arms but i think the bushings should have lasted longer than 2 yrs.not to say anything bad about Mac but....***cough...cough***i have there headers also and they generaly SUCK...