I see you have an ‘03, good for you as it’s easier. I installed mine long before I purchased an awesome flaring kit. Every fitting I used came from Advance Auto’s shelf. Quick, simple, and no need to modify the factory line.
From what I recall the factory fitting at the master was a 10mm bubble and the Hurst line locks come with standard IP threads. Basically you just bolt the line lock to the fender well, unhook your line off the master and swing it over a little add an adapter fitting and a 10” or so already flared line and plug it into the line lock out port. Then you add another short line from the line lock in port to an adapter screwed into the master.
I just used a $4 door bell button from Home Depot and mounted it to the A pillar. Run a line from your brake light switch to the trigger, then off the trigger to the line lock red wire and find a close by ground. Easy Peasy and fully reversible in minutes.
I’ll try to to find my thread on it to help you. If I can’t find it I’ll grab some pics. But zero need for any kits.
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