different E.T number
 

will wheels with an E.T 4 fit on a saxo with spacers? if so what ones?

They'll fit but would be online with the arch.

Normal Saxo wheels are around ET14 - the above wheels would sit 10mm further out.

but they will go on?

yes if there 4x108 and the right centre bore but will be pretty close to the arches and dependent on width might poke out

8.5 wide? is that goint to be extreme poke, or will i get away with it?

Bloody wide - will probably poke out from the arches which is illegal/MOT fail

ye but your allowed 20mm tread out of the arch am i right? or will these stick out rediculously far?

There is so much to this! Everything is dependent on everything else! ET is entirely dependent on wheel width!
Legal wise the entire of your tread has to be covered (thus the idea of stretch tyres!)
Do you have an MSN you can pm me and I'll try to help you out

na aint got msn. going to give up on these wheels i think, too much hassle!