A big thanks goes out to Greg for going out of his way to get me that missing pin! Pump is now installed and my leaking oil pan gasket has been replaced. Upon dropping the oil pan, one of the first things I did was check the condition of the oil pump nut. Even with my occasional run to the 7k rpm red line, the nut was still quite snug.
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