RIMS

ok so i got my rim today finally and i have a few ?'s i will have pics up tommorow. the main thing that i want to know is what are some good spacers im thinkin maximum. the rims are 17x8 and of course because of gay ford the rears are tucked in when i get the pics you guys can tell me what size i should get. oh and if anyone has any that i can buy please pm me