Bugfix: In V1.1.2 the pictures of some car-auctions were enlarged from the 300Px-pictures instead of the 500Px-pics. That results in low-quality enlarged pictures.
The version 1.1.3 should solve this problem now. You'll find it by clicking the link "show all versions" in the bottom of this page and load the extension in V 1.1.3.
Since V 1.1.4 (see "Show all versions"): Because motors.ebay.com now uses two different scripts for showing articles, this extension just works with that article-pages what shows the item-pictures directly in the bottom of it's pages.
For articles at motors.ebay.com that opens a new page to show the item-pictures, please use the extension "ebay - item description - show enlarged pics" what is linked in the description of this page.
For the functionality at motors.ebay.com you should install both extensions.
Sorry for this uncomfortable solution, but thats the only posibility to solve the problem with two different item-pages at motors.ebay.com