Are the 300e and 300d the same 123 chassis? If so the shocks should be the same, unless ther is a consideration for weight of the different engines. I would lean towards the installation by Pep Boys. I got my tires there. Good tires , good price, but I walked around the corner just in time to see the mech beating on my hubcaps with a mallet. he had already broken two clips and was going for a third.