Ive never used my chassis number. On mines it goes like this,
I click VW
scroll down the left hand side and click on Golf it will also say at this point what types like R32 4MO petrol dev and a give you a year like 98/04
A menu will pop up asking the year, in my case 03
It will then take you to another screen with 6/8 options (can't remember) with pictures on the left for the likes of body, service parts, front drive train, rear drive train and so on.
So say I'm after a front wishbone bush, I hit front drive train and up pops another menu listing all the different set ups and on the far right it will say what car it's for. Look for the one you after and hit it.
A picture will now pop up showing you all the different parts that make up the front drive train.
Click on the number thats beside the bush and the part number and price will pop up
Hit the back arrow at the very top of the page to go back.