nitrous_fed_03gt

i have an 03 gt that im getting ready to purchase a pair of weld drag lites for the back. the wheels with tires on them are 15x10.5. ive been told that i will need to remove the quad shocks in the rear to make these fit?? i have no idea what the quad shock is. can anybody please help with this and let me know if its to big of a pain to remove cause if thats the case, i will just put a 15x9 on the rear instead. thank you