FRAME DIAGRAM ANYONE?

[sr20deTsomeday118]

i could really use some help here guys, i have rust on my frame rails and its possible to get them from most nissan dealerships but i dont know which ones to get, the rust is just behind the wheels on both sides of my car on the outside part of the frame rails. either a diagram or just telling me what part of the frame this is would be a ton of help..both pics are of the bad side(drivers side) any idea of what part this is

[silpena]

i have one around i'll try to scan it for you its a genisis diagram frame spec's.

[sr20deTsomeday118]

thanks a whole bunch, i need to get this done