I take it as just the lever snapped I wouldn't need a cable or anything?
What an effort for just a bit of plastic ay!
Can't really say for sure on the mk5 but on the mk6 you have to watch what you remove as there's a piece of plastic which MUST be left in place or there will be nothing to hold the cable in place and nothing for the new handle to attach and clip onto..... I still have the fitting instructions with the one I bought, once I finish work I will take a photo of it and upload the pic (if I think it might help you)
Not sure (without seeing a pic of yours) whether you need a new cable too..... Can you see the end of the cable nestled in the remaining part of handle? There should be like(the end of a bikes brake cable) you should be able to grab it with a pair of pliers and pull it and operate the seat?