FCP sells one for the N55...
To remove the injectors you don´t need any tools. I changed them a couple of times just by pulling them with my hands.
You more probably will need tools for the new sealings which I bought directly from BMW.
Ok, after getting the wrong injectors swapped out for the correct ones, I got them installed this weekend and everything seems to be going well. It ended up not being too terrible of a job after all. The last two were a little annoying with all the wiring harness bundles, o2 sensor connections, and working around the hood shock but everything worked out.