Hi I'm new here and need advice on buying parts. Just found from mechanic today that my car isn't driving properly because the transmission input speed sensor is not working as expected. From what he's explained to me is that the part is a DEALERSHIP ONLY part. Is there any where I can buy one online without being suspicious of buying some that's dealership only so i won't be over charged for it? Car model is 2006 Dodge Magnum SE 2.7L