I know that there is a difference in the castor angle of approximately 1.5 degrees between the Gta/Gti and the cooking models (as well as a small camber difference). Looking at the spares available for the front suspension it appears that there are different part numbers for the wishbones and for the lower ball joints depending on whether or not they are destined for a Gta/Gti. This leaves me with 2 questions:
1. Is the difference in castor angle achieved solely by the lower wishbone or does the upper suspension arm play any part in this?
2. Is there any geometry difference in the bare wishbones between the cooking and the Gt models or is the difference confined only to the lower ball joints?
My wishbones have been replaced by the previous owner using a local garage. Although both sides were allegedly done there was a gap of some years between doing 1 side and the other. Ever since I have had it it has pulled to one side and in a car with such delightfully delicate steering (albeit fwd) this is beginning to bug me. Camber and ride height are closely matched side to side and toe-in and tyres are fine.
The basic idea is to buy a matched pair of ball joints but I don't want to do all that work fitting them if the geometry remains unaffected. If the advice of anyone out there will keep me lazy for a little longer it will be much appreciated.