Idler arms early a vs 67 up cars

I would imagine you would need to use the 68 idler and pitman arms as a matched set. A 68-72 idler bracket. Not sure where these would position the center link. You would want to change the pitman and idler as a set. If theres a length difference between the 68-72 idler and the early A pitman arm, and you dont do this, it will change the Ackerman angle when steering the car.