4/6 drop, what size wheels?

[Joe_brock_jr]

Hey guys,
Dropped my truck 4/6 using a flipkit and bags out back. When I had it dropped, the shop said the wheels would fit. Well guess what...they dont. The back tucks quite well, but the front tires rub when it hit a little dip in the road. Do you guys know what the proper size wheels should be and what the backspacing would be as well? Im thinking of going 20 or 18x9. Thanks.