| The lever you are referring to is the headlight auto-level sensor arm (fyi, there's another sensor at the rear of the car). Normally you would just disconnect it from the old arm and reconnect it to the new one but the new arm doesn't seem to be drilled with a hole for the bolt to affix the mounting bracket. What brand arms did you buy? You sure you got the correct parts?
Haven't needed to replace control arms yet so I don't have any experience to share. You might have to get creative to reach those inner nuts. Maybe you will find something here that will help:
04 IR 330i ZHP | ESS TS2+ SC | MagnaFlow "headers" | KMS 3.64 LSD | AST 4100 550/650| APEX ARC-8 18x9 | H&R front sway bar | Vorshlag camber plates, RTAB limiters | TMS subframe & swaybar reinforcements | UUC SSK & DSSR | UUC TM & TME | BW motor mounts | Dinan strut & shock tower bars | vaio 4-bolt oil pump