So I feel I should just interject here with a few things to note.
you can get the MK7 wheel into a mk5 and have it working, but there are a few things to get over.
1st don't buy the wheel with cruise buttons on as these will never work and clutter the wheel.
2nd buying from eBay is hit and miss on whether you get red or white lights
3rd further to above I have MK7 wheel but it came with polo airbag, I'm not really to bothered with this but again you don't always know what your buying
4th so illumination, apparently there were ways with modules and adaptors to get this working, well I got it working by feeding 12v directly to the LED's on the switches (please only do this if you know what your doing, its very easy to screw the switches)
5th the CH module will allow all the buttons to work but you may also need to loose 2 menus on the red display and use bap protocol on some stereo's, sadly I don't have a red MFD in my car anymore so I can't give full details, but using white display in mk5 all works as it should with MFD, stereo, computer, BT etc etc
so it can be done if you really want it.