It will be a big deal, as those kits are designed to plug right into the bulb socket, and use external relays to strike the ballast and illuminate the bulbs. If the bulb housing is different you'll need to make an adapter plate to fit the bulbs in, and you'll need to figure out how to wire them into the stock wiring to use the stock headlight switch. I'd send them back and get the proper ones. Also, for $50, they're probably going to look like ****.
I'd also be wary of the fact that the seller didn't even know what color temperature they are, as he lists between 5000 and 10000 degrees.