In order to get the throwback Oakland look I've included:

A. Raiders end zone (and alternate end zone)
B. Raiders field
C. Oakland Home
D. Oakland Away
E. Black field numbers (winzip)
F. Original SOMFB white field numbers (winzip)

Open up the SOMFB - Graphics folder
1. Place the Oakland (or alternate black diamond) end zone in the SOMFB Teams folder 
2. Take the Oakland FC and place it in the Field folder
3. Take the Oakland_Home and Oakland_Away and place them in the Players folder
3. Take the SOMFB black numbers and unzip them into the Field folder (click yes to replace)

After placing the files into the folders then you must select the files for in game use.
There are numerous ways to do this but here is one way: 
a) Open up your League and select Oakland
b) Up top click on the Team column and from that drop down box select Notebook
c) From that screen click on the radio button labeled Info
d) To the far right of the row named Center Logo click on the button
    by default this should take you to the Graphic - Field folder and then you select Oakland FC
e) For the End Zone repeat the same process as you did in d) click on the button to the far right
    of End Zone, by default this should take you to the Graphic - Teams folder and then you select Oakland 
f) Use the same procedure to pick the Home Uniforms. Clicking the button should default to the
   Graphic - Players folder where you will then select Oakland Home
g) Repeat your step f) for the Away Uniforms. This time choosing Oakland Away

In order to restore the white field numbers for the games away from Oakland.  Simply take the zip file 
title Original Numbers and unzip them into the Field folder (click yes to replace).