Do you have the 3.7? If so then no, you can't add the little shift lever. That's to engage 4 wheel drive low range only, which doesn't come with the transfer case with the 3.7. You just have full time 4 wheel drive with open differentials (if you have the 3.7). If you were thinking the lever disengaged 4 wheel drive to 2 wheel drive, none of the WK models can do that. They're all full time 4x4.
2007 CRD QDII- ROR springs on 265/70/17s
2010 Jetta Sportwagen TDI 6MT - Stock for now...