I just had to replace fuse #8 this weekend as well (my wife somehow blew it but is playing dumb). Luckily I used this thread:
http://www.1addicts.com/forums/showt...diy+fuse+panel
Which links to the pics that may help you here:
http://kfiducia.com/V1Install/
Using that and the card reference, hopefully you can figure out where to put this fuse.
Please note I believe the fuse box setup will be HEAVILY dependent on your options. My 08 135i did not match up to the ones in the pics above if memory serves me correctly. I have most all options except nav and heated seats.
Attached is a highlighted card reference to make finding 10A mini fuses easier