5mm spacer will do the job and i would guess longer bolts needed as well. Only issue i can see is this will exaggerate the usual appearance of the front wheels sitting further out in the arches than the rears, unless you space the rears as well which means longer studs and the associated work in removal of old ones and fitting new. If it was me I'd sell them on and get a set with the right offset/ET
I have ordered some 6mm spacers for the front. Hopefully they won't look too silly as it is only 6mm.
Strange as the seller had these on a syncro with no spacers fine. There must be a slight different offset for 2WD and Syncro.
On a side note how far does the stud 'go past' the brake disk face? I.e if the new steels have the same depth as VW steels have I got 6mm I can sacrifice?
Yes strange but i would guess (and it's only a guess!) that with the Syncro being 4WD geometry is different, certainly some parts are Syncro specific.
Re longer bolts, the simplest thing would be add 5 - 6mm to whatever the standard ones are, that way you keep them fitted as VW intended however a better solution would be to speak to Brickwerks and get studs for the front with the associated nuts, fitting spacers with wheel bolts is a pain in the backside as you have nothing to locate the spacer on before offering up the wheel
I guess if they are already M14 they are likely to be OK but I would check with Brickwerks, Mefro wheels take M14 studs without drilling but have r12 seats.