Only one of them won't fit right away (either the dome or the trunk bulb), check the pic above.By pushing a bit the connections, you will make it fit in place.So, even if the seller did not change its offer, you will able to use them, you will just have a bit of work to do.
As for making my own, here is the thread about them:
zer...hange
I still have to do the two at the front but I have to buy more white leds.I will probably redo the two I have done already too , because I want to do the trunk one bigger and no more PnP (will cut some plastic to get more space), and the dome one smaller as the one I made gives too much light to my taste .
I did my own because I wanted to have a little bit of fun doing some electronics.I may put them on sale but I am not sure someone will be interested as they are not pretty looking. The ones for sale for now are the ones I got from Ebay.
If you are bothered by the yellow tint of the OEM bulbs and you don't plan to do them yourselves, the PnP bulbs on Ebay are enough (look at the comparative pics in my thread). That is what I did at the beginning since I bought them.