little help..

ok i was told a bunch of different things from alot of people... like i could hard wire it a harness from a radio in or i could buy a gmos 06 or 03 and that would work.... i was told to get the 02 and run my own power wire.... soo what harness do i get.....

i have a 1996 el do... with bose system i plan to use stock til i can new spkers..