I have done loads of steering wheel swaps, from the E36 days through to retrofitting the M5 wheel on my 535d back in 2005 when everyone said it can't be done.
Loads of them on eBay and all listed as F25...
We talking about this wheel?
http://www.ebay.co.uk/itm/GENUINE-BM...item5d5a0f18a6
http://www.ebay.co.uk/itm/BMW-F30-F3...item3cfc354419