need to get a throttle cable for a /6 to 318 conversion - but which one and where

heh its going lol! talk about jumping headfirst. between discovering leaking brake lines that were "brand new" according to the previous owner, rusted bolts, jurry rigged things, and my own lack of knowledge and working outside, it's been a challenge but hopefully this week will see the fruits of the labor. i have learned a ton and although i get frustrated i thoroughly enjoy the challenge. now i want to drive it !!