So I bought some Challengers...

[dirtydirtydiesel]

I know it's a bit late to tell you this but if you want the wheels to be square on all four corners then you need 30mm on the back & 20mm on the front
Sorry but I've only just read this thread
p.s post up some pic's when you have it all sorted

[grey]

20mm all round fitted perfectly and pushed the wheels back out to where they should be:

[GingerMagic]

Looks lovely - I must pull my finger out to get my Challengers on too....

[GingerMagic]

Finally got my Challengers on - I used 20mm hubcentric spacers that bolt to the hub, but the bolts were too long and were touching the handbrake springs, so just used longer bolts straight through the wheel and spacer and so far so good...
My car now just needs a good polish, the wheel touch-ups can wait.

[dirtydirtydiesel]

Looking smart on your new rim's mate ,
Will have to sort some when funds allow

[grey]

That looks great Ginge, the painted calipers are a nice touch.