2007~2015 Rear Caliper Bolts

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2009 Mazda CX-9 GT
I did my brakes on the weekend, and one thing needs to be clarified. On the rears, on the caliper bolts, one has a rubber guide and one doesn't. I was motoring and didn't pay attention to the location they came out of. Both bolts are identical except for this guide.

Question: does it matter if they are on the upper or lower position of the caliper? I put them in the lower, so hopefully I guessed correctly. LOL

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They are sound dampeners and the lower is the proper spot. Some vehicles have different sizes on the threads as well to ensure they end up in the right spot, apparently not on the CX9 though.