Need a little help with the backspacing. Not to sure what I really need. I am going to get some BMF Novakane and I was wonder is this ok on the back spacing for a 2004 F350srw. I do have leaf springs in front. 20x10 Bolt Pattern 8x6.69 Metric 8x170 -19 Offset. Thanks for any help. To much money to put out and get the wrong thing.