right manifold 340/360

I have been doing research . i have an a body left manifold 340/360 i am going to use in my kids dart i am having trouble finding a center dump that matches the left side outlet about 2.25 inches did they make them? it is cheaper to but tti headers than being forced to buy a pair of TA style exhaust manifolds. i have a rt side center dump 340/360 but is only 2 inches maybe a little smaller. maybe on a stock engine it wont matter but seems like the same is a best idea
Thanks Bill