Ouch, I've done that before too, sucks but I caught it right after I clicked order and it showed the wrong size in my receipt email so I was able to cancel in time.. If you don't have any upgrades to the factory fog lights, you always could use the H11 there too.
So when you get the H1's, what you do is pull the round ring ("mounting plate as in step 2 of pic) off the bulb and then with the holder/adapter, you mount/clip just the ring inside the headlight. Then you add the main bulb in through the ring you had pulled off the bulb to start and have full 360 degree adjustability by twisting, it's a nice snug fit in the ring I had to web search and found a pic that explained it, I was stumped at first too.
OK, found a good pic... So, ignore that it says for H7 in the pic, as it's really H1 holder/bulb shown, you can see on the stalk in pic 7, lol... Follow steps 1-5 then mount/clip that into the housing, wide spot of ring facing forward. Then insert the bulb into the already mounted ring. So imagine step 6 and 7 happens after you have already clipped the ring/adapter into place after step 5. MUCH easier to clip the mounting ring into place in the housing spot first, then add the bulb after. The clip and ring doesn't stay together super well as shown in pic 5, so it's easier to hold it together and get clipped into place first, then trying to get pic 7 result mounted into the housing as last step.