i recently bought a new pittman arm for my 68 bird', the original is curved, and this one is strait. the length is exactly the same as well as the hights (from the mounting spot on the box side to the ball joint side ) is the same as well.will the strait one work?? change it change the steering geometry?? was the curve for clearance?? any fellow ponch-ahollic with any info would be greatly appreceated