Seats or auto parts from a conversion van can be sold through eBay and online classified sites. Craigslist is a popular classified site that offers its users free postings and can be used to sell auto parts locally.
Craigslist lets individual users post free ads that allow room for a description, several photos and location of the item. This site is very useful to sell larger items, such as conversion seats, to a more local audience.
Online auction sites such as eBay allow a user to sell seats to a global marketplace. The item can be listed with a reserve price and the buyer with the highest bid above the reserve will purchase it.