You Have measurements to do Chain line, and the Q of the crank are 2 ( arms on same side rather than crank placed

measure how far apart they are with one BB on it , and see how much width the chainstays
are where the crank arm passes by..

and in this situation, you will need a lot of pictures of each step in the process for remote help here ..

Internet sellers wont be any help , they will ship you parts, But, you need a local bike shop ..