Check dimensions. Hope this makes sense as I can't think of a way to upload the drawing I have. I've even tried to take a photograph, but you can't then read off the dimensions.
Here goes.
Take a line through the centres of the inboard pivots. Draw a line perpendicular to this through the centre line of the outer balljoint.
The steel bushes which house the Spax bushes at the inboard end of your wishbone should be 30mm long, each one.
The dimension between the bushes should be 218mm. Therefore the overall spread of the wishbone at the inner end should be 278mm.
Going back to our perpendicular line drawn through the balljoint centre, the "forward" bush (inner end) should be 40mm forward of this line. The rear most bush (inner end) should be 178mm to the rear of the line. 178+40= 218 (the distance between the bushes).
Centre line of the balljoint should be 230mm outboard of the inner pivots centreline.