The online store needs less steps to get the category that you want. Maybe try a vehicle selector like tirerack.com. It's visually appealing, but navigating the store means a lot of clicks.
And IMO not having a picture of the product or just using stock photos is frustrating. As well as using stock product descriptions from the manufacturer. It might take more time to list the items, but makes the user feel like they're buying a product that the dealer actually uses.
And lastly maybe add some styling to the product details, to me it feels kind of scattered/unorganized with the different fonts sizes and colors and paragraphs.