This bracket will replace the 4 single bulb holders with a single holder. It aligns the bulbs in the center of the inserts, instead of at the bottom or at the side. Very easy to install. Simply remove the 4 screws holding the single holders in, use 2 of those screws to put the new bracket in (using the same holes), and insert the bulb holders. Only takes a minute or two and is fully reversible.
If you live outside the US, please contact me for shipping prices.