steering wheel is about $800.00 TO REPLACE WITH air bag reinstalled by certified technician. shift knob comes off pretty easy you can do that yourself. good luck.
Find a steering wheel at www.performanceproducts.com. Cost is $599 for standard replacement (wood and leather). You need to know your color scheme... mine is Java for example. You'll reuse your center/airbag. Don't even try to replace this yourself. I paid $79 for my mechanic to handle this. I suspect any Euro-performance shop or mechainic has the proper tools and skill. Body shops should be able to do this as well.
The shifter comes off with a trun of the locking ring (chrome at bottom of the knob) using your thumb and forefinger. Pull straight up to remove. Reverse to install.