Dummy OBD Port Install Focus ST MK3/3.5

Just had my Stealth Grey ST3 nicked of my drive with a Disclock fitted on it not happy about it. As soon as I get my new one I'll be doing this and lots of other things to try and keep it safe from the dirty lowlife thief's

Where can you buy the dummy ports from please?

Where do you find dummies OBDs

what is the purpose of connecting the obd dummy port to the real one? A smart thief would only have to pull out the cable and find the real one. This doesn't seem like a very effective solution to protect your car.