Daaang dude you did this! Ironically I have been looking to do the same exact thing about the same time you were doing this apparently , but never thought to look on this board for ideas or answers! I bought similar bulbs off ebay without however considering too heavily how they would fit in my headlight shell other than being aware of the H7/H4 base converter. Agreed they are superbright, but I couldn't straight swap the fit without modifying which is what you obviously found a way to do. Can you please share pics detailing your setup? I saw the pic of the rear with the fan sticking out of the rubber grommet. (not scared of water hitting that though?) I also saw your written description of the mod, but a pic is worth a thousand writeups!... or something like thatGot a set of these for the car. These are the best ones yet. And cheap! wish i just bought three pair of these to start with. 200W CREE H4 Hi/Lo LED 20000LM Auto Feel Headlight Lamp Kit Globes Bulbs Updated | eBay
Most of the ones on ebay claim stupid wattage and lumen figures so its kind of hard to choose. But these ones seem good quality. The cut offs are spot on and they are really bright. The ballasts are in a cast alloy box about the size of a deck of playing cards with provision for cable tying them.
Edit; the ones i have claim 40w each and 4000lumen each but are exactly the same.
Anyway congrats on figuring this out. Not sure how the rest of our community feels about this mod, but this is HUGE to me Way to go squid!