The europarts site uses your reg no and has been totally wrong on two occasions for me now.
+1, always know your engine AGG/2E etc when working with ECP.
Also if you own a 95/96 Mk3 they did have a lot of stuff wrongly listed when I last shopped there for my old Mk3 (ADY)
I Always take a picture and check it in the box on the counter or look on etka for vw part number and go armed with both.
If you can take the old part in even better.
Driftbridge Epsom has a load of Dub nuts working there (Lupo Boy ( ED38) and they know there bits, so if I'm flush I go there

I use ATE grooved discs and pagid pads from ECP, and bleed the system every brake change with fresh fluid, cant go wrong with that.
At least now you know what disc size you are
