Anybody know how I can get 3.1.3?

My 3G iPhone is currently at 3.1. I have my iPhone 4 but keep the 3g just for misc stuff. I tried to download the find my iPhone app so I can use it to track down my iPhone 4 if I need to But it says that I need at least 3.1.3 to use it. I don't want to put 4.2 on it but that's all that iTunes offers me.
Anybody know of a way for me to do this?

download iPhone1,23.1.3_7E18Restore.ipsw
*On Windows*:
Hold the SHIFT key while clicking the "Update" or "Restore" button in the iPhone tab in iTunes
*On Mac*:
Hold the option key while clicking the "Update" or "Restore" button in the iPhone tab in iTunes
a dialog box will come up which will allow you to select the firmware file to use for your update.
At this point, simply browse to and select the firmware file that corresponds to the version you'd like to restore your iPhone with.
Firmware files have an .ipsw extension

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