Those are non genuine units by the look of things.
My suggestion it to only buy genuine k04 units which use genuine parts.
Remember when buying anything from the U.S you will be hit with vat, duty, admin fees etc
If leaking from the rocket/cam cover gaskets then oil can & will contaminate where the spark plugs locate, you will also have oil make its way onto the down the back of the heads on to manifolds, turbos etc.
The correct ET of the rs4 wheel is ET20.
If the wheels you are looking at are ET43 then they are either a genuine wheel which was offered on things such as the 8l s3 etc. Or the wheel is a replica wheel.
A low offset wheel sticks out. A high offset wheel side more inboard.
Speak with rich at viper tuning or Rick at unicorn. Both these guys specialise in custom mapping and are very well know within the B5 S/RS4 scene.
Feel free to drop me a pm. I have a b5 rs4 and live in glasgow so will be happy to point you in the right direction.
Finally got the chance to fit my 034 gearbox mounts and apikol carrier bushes. Next on the list is my new 034 arb and brackets, then its some rs6 egt sensors, new map and heading for the 700bhp barrier :-)
I have a couple of Inner track rods to do on the rs4 also.
Just a thought. Why dont a few of us pitch in and buy the specific tool for the job? It might cost us £10-£20 each but it is much better than paying £50+ for a tool that you are likely only going to use once.