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Im not entirely sure what lights the 172 has if there the same type as the mk3 dynamique s head lights (sort of ball lense) mine fit strait into the same fitting with the 2 connectors just attaching to the HID unit instead of the bulb. The only issue with them is getting the wires past the water seals on the back to stop them steaming up a bit of silicone sorts that though. justjust
Just make sure you buy the right bulb type HID's sorry i think im thinking of the newer one to yours but even so if you get the right type then it shouldnt be a problem.
You can get HID kits that fit straight into your reflector headlamp, but all other road users and people on here will hate you, unless you get projector style headlights.
I think you'll find it's a 'grey area' which means if the MOT tester is an anorak then you might be in for trouble, most of them don't know the difference between a tealite and a halogen bulb which means you'll probably be okay.. I have never had a problem.