When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
My understanding is that the 15inch OEM wheels won't fit the MCS because the brakes are bigger. I've heard that Sport Edition makes a 15inch wheel that will fit the MCS - info and the wheel available at Tire Rack. But that doesn't help your situation. I don't know if there is a solution. You might want to do a search over in the tire and wheel forum. Good luck!
That is a possiblility, but you will have to make sure your lug bolts are long enough to work. That is very important. Me, I'd sell them & buy a set of 16" wheels for winter use.
I wouldn't guarantee any pre-07 16" oem rim will fit (specifically thinking of x-lites) . to get the JCW from the factory in 06 you had to get 17" rims because of the larger brakes. I think only the 16" bridgespokes (which you can still get) will fit.
Perhaps it's obvious only to me but why not put snow tires on your stock 16" wheels and upgrade to something else for the summer. That's what I'll be doing.