You'll need to get a multimeter, and check the resistance of the VATS resistor in the key. It's dead easy, I'm sure you'll know someone you can borrow a multimeter from for 5 minutes!
All VATS keys have a resistor embedded in the key blade with metal prongs protruding out of each side of the key blade. In order to read the resistance of the resistor in the key blade, place one lead of the ohm meter on one metal prong, and the other lead on the other metal prong, opposite, on the other side of the key blade. With the leads in there proper position a resistance value can be read from the ohm meter.
Once you get your reading, match the resistance value given by your ohm meter to the resistance value, in the right column, in the chart below. The value from your ohm meter will probably not match, exactly, the resistance value in the chart below, but choose the value closest to the value on your ohm meter. The corresponding code number is the identification number of your VATS key.
Code:
CODE RESISTOR VALUE IN OHMS
1 402
2 523
3 681
4 887
5 1130
6 1470
7 1870
8 2370
9 3010
10 3740
11 4750
12 6040
13 7500
14 9530
15 11800
I used a place off eBay for my old RS's spare key, local place cut it.
will do.