I've actually done this mod on my 335 dct a couple months back when I fitted an M3 steering. Been meaning to post a DIY for some time, so hope the OP doesn't mind the thread hijack. :sorry:
Source the paddles of ebay:
http://www.ebay.co.uk/itm/BMW-E90-E...arts_Vehicles_CarParts_SM&hash=item4d0f4ec359
Took about a month and a half to arrive and had to pay R20 when collecting from the post office.
Followed the DIY in this video:
Here are some more pics of the install.
Old DCT paddles removed from steering
Disassemly of pivot pin
Small ball bearing - don't loose this!!!
Paddles fitted to steering
Fitted
If anyone needs some assistance in JHB with the install drop me a PM. It's a pretty easy DIY and can be done in less than half an hour.
I strongly recommend adding this mod as it really improves the DCT driving experience!!! :thumbs: