I just want follow up on this:
I didn't like how that guide rod protruded, so I put the stock setup back in my MK9 and stuck the Wolff kit in a drawer.
Fast forward to a few days ago when I noticed a NIB Wolff kit for sale (at a very good price :)) on another forum. I decided ti give it a go.
I pulled the kit I had from it's drawer and found that it's guide rod was significantly longer than the one I just received; otherwise they seem the same.
I like this look much more:
http://i64.tinypic.com/bil6cg.jpg
Now that I know for sure it was the length of the old guide, I may trim it down for a flush fit and give it slight bevel (vice the cone shape it has).
Regards,
Greg