Did mine today after letting the car sit for 2 weeks. after replacing the downpipe, it started pissing yesterday.
Gasket - VW dealer - $5 (several in stock)
Oil and filter $15 autozone
1 1/16 deep socket at autozone $6
can of brake cleaner $3 autozone
Time - 1 hour.
Old gasket came out in about a dozen pieces. new gasket had the little loops to hook onto the cooler.
pipe came out with a pair of needle nose pliers.
Tightened the nut against the old filter to tighten the pipe back into the cooler. Removed the filter and tightened the nut.
With this thread it was a breeze! I was originally looking at the 2 allen bolts in the top to the adapter going to the block hoping I didn't have to take those corroded SOBs out.