They are VERY WEAK from the point of view of sideways(kerb) knocks, ie it does not take much to bend them.
Why not just get a geometry check done it will soon tell you if something is out, can't see it being the arms as these are strong.
As for whether it is the same as others I would check the part numbers at FORD this would tell you.
I thiught all the geomtry was the same on all beams(sierra) but just different diff width brackets.
tabetha