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The splines changed 71.5, that half way through the 72 MY to you and mesparkywig said:What year?
The splines changed 1970 MY.
From the point of view of IRS'ing a split, you can use springplates upto and including 1971, and half of the 72MY production too...I would suggest the 1970 springplates you had, weren't actually 1970.sparkywig said:A set of 1970 rear spring plates wouldn't fit on my 1969.