Parts are listed usually with a brief description, as well as the quantity, and the price. There are three types of parts: OEM (parts made by or for a manufacturer). These are the parts installed by a dealer, although many local shops use OEM parts too.
Aftermarket parts are non OEM parts, and there are various degrees of quality, depending on the brand and where they're made - China versus USA, for example.
Then there are Used parts purchased from a salvage yard.
To determine if you paid too much for parts, first find out what type of parts are being used. With OEM parts, you don't want to pay more than MSRP, although most people do without realizing it. Premium aftermarket parts are similarly priced across brands, although beware not to pay more than MSRP, which again, many folks do. Used parts prices are all over the place, so pick the price in the middle.
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