Do you have the 6 or 4 piston front?
To the OP...I'd stick with the 4 piston front unless you plan to put your OEM wheels back on and refuse to run spacers. I have the 6pot front calipers and it is a PIA to find pads. Everyone does make the 7420 pad in a 20mm thickness for the 4 pot caliper...hard to find the 7416 pad for the 6 pot.
Both the 4 and 6 piston kits have the same pad shape...the 4 piston kit uses a 4mm thicker pad.
If any track time is in yourr future, DEFINITELY get the 4 piston kit for the front.
2013 F30 328i - Melbourne Red
2011 E90 M3 - Monte Carlo Blue
2004 E46 M3 - Imola red