ok,

what you need is Standard BMW alloy wheels.
Spigot rings 72.6mm to 71.1mm (i had to have these made!)
14mm Vairy centre (wobbly) wheel nuts
16mm metal drill bit.

a bmw stud pattern is 120 x 5, a vauxhall Vivaro stud pattern is 118 x 5.
The wobbly wheel nuts correct this. (they will correct any 2mm vairation)

Bmw spigots are 72.6mm and a vivaro spigot is 71.1mm
The spigot rings correct this.

16mm drill bit is for the hole in the alloy what the bolt goes through.
Thankfully i didnt have to drill but it needs 16mm for the wobbly wheel nuts to ..erm... wobble into place.

The spigot ring is essential for the positioning of the alloy on the hub. Without the spigot rings im told there would have been serious judder on the steering as the wobbly wheel nuts wont centre the wheel like on a normal hub.

For all of you talking about my tyres, thanks for your concern, but the tyres are XL LOAD and i dont carry much weight in my van anyway.

I could have put 20" X5 alloys on, but i really couldn't afford the tyres every 6 months. My alloys are 18" with 225/40/18 tyres on. cheap as chips tyres. well, compaired to 20's they are.

For the people on the BMW forum, i will change the centre caps for vauxhall ones and put a bit of tape over my M badge.

Oh yeah, SNP and Stavros, this is my own van not a company one, so i want it to look the part.