+35 all round, Liam..
I can space them 3, 5 or 7mm, but at the moment, I have no spacers as they are wider then the 18" Rays and therfore sit further apart.
Might try 3mm later in the week.
+35
You'll need bigger than 3mm spacers, more like 20mm
20mm sounds a bit much. 15mm sounds better.