Ah so the MK5 discs are more inboard, or deeper offset. Thought that may be the case 
What a pain in the back side! Looks like you might have to do some welding/redrilling on MK5 discs, or get some custom 2 pieces discs made up. I wouldn't be entertaining spacers on the calipers personally, although it might be OK if you don't punish the brakes regularly.
I thought spacers would be a bad idea alright but I was thinking more along the lines of the type of alloy bracket you see for brake adapter kits. I've been searching the online systems of several manufacturers all day today and yesterday and I
THINK I may have a disc for the front which will get me out of trouble.
The discs on the MK5 as mentioned are drilled with 9 holes preventing me from drilling the 5x100 PCD unless they're welded, drilled and then spun on a lathe to ensure that they run true when fitted.
Using the comparison on the Delphi site I was able to find discs that are extremely close in spec and have only 5 holes allowing drilling to the desired PCD.
If you ever need to use it, here's a link :
http://www.delphicat.com/WebForms/frmDelphiHome.aspx#1487083197269The Disc numbers if you'd like to take a look at the specs are : BG3953 (standard) and BG4079 (supplementary).
You can also search by size without part numbers and set the tolerance to a desired percentage to see what results come back.
The rears are proving to be more of a problem however, I've found a set that should do the job but they wont fit over the bearing hubs. That may be overcome by turning the bearing hubs in a lathe and reducing their overall diameter to fit inside the discs.
It's getting to a point of being sorry I started!!
