For safety reasons I wouldn't buy Ebay crap steering wheels.
They have to be genuine MB s-w.
Get yours retrimmed with new leather or rewrapped with carbon fiber, might be steep?
Regarding your interior trim you can search on ebay for faux eurotrim panels.
I have a centre console for sale.
you can install folding mirrors, power rear blind, on/off switch for other electronic gadget?
Wodden trim isn't that hot in a w202 if you want it to look like Sporty James, I mean Sport version.