I have a comet 20 asymmetrical torque converter and I when I bought it no belt came with it. My driven is 6" in diameter and from the driven to the other pulley it was 7 1/8 - 7 3/16. the belt model for that is 203579a. Now I can find that belt but, but I can't find a asymmetrical 203579a belt. So I was looking at at comet 30 belt which has the same measurements and is asymmetrical. The model no. Is 203590a. Please I could use some help