What size bolts?

Ordering 20mm spacers all round for the 197 next week. Can somebody tell me what size bolts I need to order for these please?
 
Are you going for the bolt to hub spacers (hub centric style), if so then your standard wheel bolts will be perfect.

if you are going for a spacer where you have to bolt through the spacer to fix to the hub, just whizz out one of your bolts, measure it and add 20mm.
they are also M14.

HTH's.
 
45mm is what I use on my 19mm. Also hubcentric doesn't always mean you can keep standard bolts. Just means there is a lot less pressure on your bolts and spacers.