That kit looks like the one you use for the oil
cooler housing, not the oil
filter housing.
The oil cooler leak is one of those Audi V8 failure points you need to watch for, but it's not relevant to an oil filter change.
To do an oil filter change, you only need to buy the appropriate filter cartridge which comes complete with the large o-ring, and sometimes the small one, included for about $25-30.
Ryco even make one (
click here), and you can often buy it over the counter in Supercheap, Repco or Bursons.
See here
The little o-ring is only needed if you remove the small drain plug on the bottom of the housing.
Once you've emptied the sump, you can pretty much get away without draining it. I never do! Just undo the main housing and empty what's left when you pull the cartridge out.
You will need a 36mm socket (or special filter tool, which is lighter and easier than a large socket - I might have a spare lying around actually...)
If 32V 4.2's have the sump plug on the bottom of the sump like the 40V's do, you'll need a crush washer too.