I would build one in house
Those lines are tricky, one one end is a metric bubble flare and on the other is a standard brake flare. Both flares can be made with a simple flare tool and you can get line fittings and sections at local parts stores.
Now not everyone maybe able to do this........but it can be done.
The 98+ trucks these lines were plastic, no more metal
Now lets see if we can find the part you need online.......