front sway bar on 04 chevy fullsize

i just finished the front with ART cool ride setup and i whent to put on the mussle bar from ART and it says to use the stock 2 bushings in the middle where the c clip things are but the knew sway bar is like a half inch bigger in diamiter i tryed to call but they are closed to talk to there tech dep. has anny body else done this or did they just forget to put knew bushings in the box

thanks

thank