Lokar Throttle & TV Cable Need install help

[54Caddy]

I need to order my tv cable for my 700r4, I found that bracket that i will use. Also found the tv cable. Now i am having a hard time understanding which throttle cable to order. I need to know what length to order and how to install. I sure hope i dont have to drill a new hole in my firewall just to install the cable or does it have some sort of washer that will fit the stock hole. Any one on here have one installed is it a fairly easy install. Any help appreciated thanks

Lokar Throttle and Tv Cable Bracket for Edelbrock Carb

Lokar Tv Cable