I am picking up a 2007 TT tomorrow and it has one leaky rear shock. Can someone direct me to which bilstein is the stock rear stock? What is the most popular replacement?

Also, for 18" rims what should I be searching for on CL or ebay? This will be my DD in the winter.

 

Does your 997 have the PCCB option? If so, then you'll need to stick with 19" wheels to clear the calipers. I bought new BBS CH-R 19" wheels for my winter tires. There are often good deals to be found on OE wheels at places like Suncoast Parts. Don't forget that you'll need TPMS sensors too. The aftermarket brands seem to work just fine.

 

If you have a durametric and are diligent, you can skip the tpms and just deactive it while you're running winter rubber.