For economics, some factories (& builders) use the same uprights front & rear. Not sure- I think an early LOLA sports-racer was done this way. Fieros, Renault RE-4 off-road turbo-racers and the Long & Newman Citation-engined cars did this since their whole powertrain was originally a front-driver moved to the back. Obviously, one end or the other has its upright mis-sized for strength. But using a link on the rear suspension makes rear toe-in adjustments easy....
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