when I put them on my rig,,,, the pices that weld to your old spring pads was closer together for the rear...
and further apart for the front perch..
in the picture you posted, it looks like you have a front one and a rear one...
do you have both of your axes off?
One thing I remember is Larry at Izook had them about 1/4 an inch higher than they should be to fit the front axel..
that is why when he was installing them, he has a picture of him grinding them to have a better fit.
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If you do not expect the unexpected, you will not find it.