Bolt size on Jeep Grand Cherokee

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I have a 2008 Jeep Grand Cherokee, 4WD, Laredo pkg.   I ordered some rear shocks for it, 911278.  The ID of the bushing at the bottom of the shock seems to be 1/2 inch by the specifications and the top at 12 mm.   My Jeep uses the same bolt both top and bottom for the shock mounts and I verified that the part number for the bolts is the same, top and bottom, right and left.   It appears to be a mismatch on the bushing ID for the bottom of the shock.  

Can you check on this?

 

Thanks.