He was working on the you're stupid so I'm taking advantage of you thing.....
Buying through an auto parts store, the price might be a little more than ebay, but definately not $340 more....
By both
@Fu Manchu and I posting links up to those parts, you are aware of what they are called so you can ask yourself at an auto parts store and price them for yourself....
I'm not saying you are stupid.....I am here to help prevent you getting ripped off and hopefully have succeeded....
Best of luck and don't hesistate to ask more questions if necessary