ARP Main Studs & Main Bearings Questions

I ordered a main stud kit for a 340 with windage tray and upon receiving I noticed that there are (8) 6-point nuts and (2) 12-point nuts. I am assuming that the 12-point nuts are for clearance issues, but where? Oil pump pick-up?? Also, there are 5 windage tray studs. I've only seen windage trays that require 4 studs, why the extra one?

Also, I received my Clevite 77 main bearings as part of my rotating assembly kit. The upper bearings have oil holes and grooves as I would expect them to, but the lower cap bearings also have oil holes and grooves (except for thrust brg, it is smooth). Is this normal or did I get a messed up set? Will it hurt to have the redundant holes and grooves in the lower cap bearings?

Thanks