I purchased a set of Champion plugs for my 900 Monster from Auto Zone, I noticed that they are a little different that the ones I purchased from my dealer which came in a Ducati package. The Auto Zone plugs were only $1.60 vs $5.99. The electrode is smaller in dia. and longer on the plug from AutoZone. Has anyone used Champion plugs from another source other than Ducati and seen this difference and will it be a problem... both plugs have the exact same designation.