Yes I recommend spending the extra $20 and getting the insulators.

Mine is only 93k miles and "supposedly" changed just before 60k miles...which now I am doubting.

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