If you are concerned over $100 every 100k miles the 103 might not be the best choice....

If you are strapped for cash right now, measure resistance on each wire using a multimeter and check it to what the wire says. If resistance is fine, they are probably okay. Just

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k