What is the difference in the trailing arms for 1960-1966 and 1967-1973? One parts vendor has different pat numbers and another does not. And while I am asking, what difference if any is there between 1/2 ton and 3/4 ton. I have a 67 with both arms collapsed(rust has won this time) and have found a 63 as a project for a new driver. The 63 is a 1/2 ton and the 67 is a 3/4 ton. If there is no real reason not to I will use the 63 as a pattern to replace the failed arms in the 67.If there is a difference, then I may have to keep looking for replacements. The things are rather spendy and that is making it a possible "project" goal. Thanks in advance. Steve.

Steve H