eBay Motors drives a large portion of eBay’s GMV, averaging 6 million per day with annual totals of 13 billion worldwide (over 3 times as much as top verticals such as consumer electronics and fashion). The goal of this project was to increase fitment adoption across our top 4 markets by encouraging vehicle novices to add parts compatibility to their listings. C2C sellers were using our outdated classic listing experience, which did not offer full functionality and was only available on desktop. We needed to migrate sellers to our new mobile friendly quick-listing form with intent to sunset the classic experience in early 2016. A robust yet simple UI was required, one that supported multiple fitment data and allowed sellers to add large numbers of compatible vehicles to their listings, quickly and easily.