I ordered a mustang ii kit from speedway, and I have the frame all stripped except for the stock axle! I can't seem to find anyone who has the right measurements for the axle center line for a reference! I have seen on the TV show trucks 20 15/16 from the end of the frame to center. Then speedway has instructions saying to measure from front shackle hole, 18 1/8 but neither one match my center line! Can anyone help me!