Bonjour!!!
Easy job to swap over as said, four bolts and one sensor that just plugs in. A lad called Gav did a load for us last year and they do crop up on here from time to time, I think there's about 25 in circulation. Of those, 3 are actually 63mm instead of 64mm and in my opinion (having tried both), the 63mm is the better option as it seems to settle quicker and doesn't lose any of the benefits of the 64mm version. In terms of it being plug and play, well, it is to an extent. But you have to give the car time to learn and the best way to do that is leaving her to idle after fitting (do not prod the pedal) and giving her ten minutes to try and settle down (will idle quite high on first start). If you then turn her off for a short while and repeat the process then it's possible to get the idle to settle within an hour or so. I've done this on two 64mm TB's and one 63mm TB so I know this technique works. However some cars do seem to take a bit longer than others to settle for whatever reason, I can't comment on what others have done after fitting them so it's hard to say how yours will react as it depends what you do after fitting...