holler anytime. I ain't sure how Nacho altered the pivot angle to make it more concentric cuz I ain't got into it yet. the speedway part number is 545-26140. I would get the 10.5 can then you can shim the arm notch later as needed. Peen or weld, alot depends on how much play you have. yes new springs to get it spot on & what are TD springs?