[Andy Green]

Hi Glen,
the position of these mounts will affect the bump steer, roll centre and and castor angle and will determinded by the design of stub axle and dimensions of the upper and lower wishbone. This is why people have probably been reluctant to give you specific dimensions

Have a read of Competition Car Suspension by Allan Staniford and it will help you determine where these points need to be

I know it's not the answer you were looking for, but you need to get it right to get the beast out of your car when its finished

Regards

Andy