Do I have the wrong lower control arm

I got lower control arms from qa1 for my 70 a-body, but the new arm seems longer by about an inch maybe, and the pivot shaft is stepped instead of straight and smooth. It also doesn't fit into the hole for the pivot shaft. It seems to me like the shaft is the one for a b-body, but the b-body arms are supposed to be shorter not longer. Maybe their arms are a little longer all the time, and they gave me the right arm with the wrong shaft pressed into it? I'm a little confused and worried about the arm being a little longer than it should be, but I know people have had good experience with these arms when they are the correct one.