Rob.
See you got those springs on ebay .. have fun :D
Thought about it but couldn't go bidding against fellow club members
Anyway, offset ...
the distance between the mounting face of a wheel and it's centreline.
If you increase the offset, you reduce how much the wheel sticks out.
So, if you fit a 10mm wider wheel, with 5mm more offset, it sticks out the same.
The additional 10mm would all be on the inside ... watch for fouling on suspension.
Or a 10mm wider wheel maintaining original offset, 5mm is added inside and out.
Generally, it's desirable to maintain original offset, specially up front.
If you mess with offset here, you may upset steering and thus handling.
Imagine the point about which the steering pivots is also the centreline through the wheel.
If you steer while stationary, the wheel will turn 'on the spot'.
If you change offset, the wheel has to move in an arc to steer.
Well i know what i mean Kind of difficult to explain
This ( http://www.tirerack.com/wheels/tech/offset.htm ) may help explain offset ...
I've always tried to keep to the vehicle manufacturers original offset ...
or as close as possible to it with regard to fouling of suspension / arches etc.
Is that any kind of help ?? :eerrrmm: