My wife found some ribbon cables that fit inside the core, and they work a treat. If you're going to buy a whole unit, there are a couple of things to bear in mind:
* Units marked "L" are for left-hand-drive vehicles and cost significantly less
* Units marked "L" cancel the indicators differently in corners. It's annoying.
* Units marked "L" also have ribbon cables in them and you can cannibalise this to fix yours
* You'll need several small thin screwdrivers to keep the tabs disengaged when trying to separate the halves of the clock spring if you are replacing the ribbon yourself.
* If you are handy with a soldering iron you MIGHT be able to repair it with solder. I fixed one in this way, but it was torn from the end, it wasn't cracked where the ribbon folds over (the usual culprit).
* DO NOT TRUST THE SUPPLIERS FOR WINDING THEM PROPERLY. I did, and mine failed immediately because it was wound wrong. Procedure for correct winding: hold the unit in one hand with the letter L or R up the right way and turn the knob all the way in one direction (fairly gently) until you feel some resistance. You've reached one end of the cable. Now, count the number of full turns the other way. I was getting about 5 and 3/4 turns, so turn yours back about 2.5 turns to aim the knob directly "up". This is now centred properly, but you're going to check. Count the turns of the knob to the left, then return to the centre by turning it back the same amount. Now count the turns to the right. They should be fairly close to each other. If not, count the turns again.
Important, vital, do NOT forget this note: before taking your steering wheel off, aim the wheels straight ahead, and mark the steering wheel against the inner splined shaft that the large nut is on. You want to locate the steering wheel the same way or it's going to feel different to drive!