I've done a couple of RRC becasue they meet the criterion for self-levelling suspensionm (or headlight levellers) and self-cleaning. Mine were TUV and EC marked as well before anyone says anything, that's whay they cost 4 times the price of some E-Bay kits.
The bulb goies straight in provided it doesn't fould the clip but the back of it sticks out a long way. The kit will connect straight to you battery and one or more good earths, electrically it's fit and forget, you can atke it out again when you sell the car :D.