post your car parts on ebay for sell and increase your site ranking via article submission, press Release submission etc Thanks Regard Tcnmart
Start a blog, find realted blogs and groups. Join in the conversation. Work really, really, really hard for 6 months min.
I would think since you have what you want to sell it should be easy. Just target everywhere that sells them. I would go to all blogs, forums, and sites that deal with cars and allow selling parts and make posts. Set up your site with a simple cart software and sell them online. Or sell them on ebay. Just do like everyone else does, make a place for people to come to see your parts, and then get the link out. Also, newspapers and magazines are great for things like that.
I will say that today their are so many local and famous bidding as well as shoping site , list your products their . If you have some high class products than join car parts and modification forums and let other know what you got for them and best rates . If you have best deals than you will sure get sales . I am personally buying bikes parts like k&n filters etc from those guys how promote themselves in my locality forums .