5.3 cutty

iTrader: (2)

i have a harness from a 02 silverado that im putting in a g body.Not knowing i ordered my o2s and they sent me the ones with the flat black 4 pin female connector .My harness has the 4 pin white square connertors.Could i adapt the two connectors or do i need the ones with the whith square female plug??
Also the ones they sent me have the holes in the tip are those the right ones for up stream?? thanks