Metal hydraulic line keeps blowing

[North Idaho Wolfman]

Buy the tubing (you can buy tubing with a thicker wall) and a bender, I did exactly that years ago.
You can get whatever end you need to weld onto the tube.

 

[Runs With Scissors]

Did you read the very first post in this thread? The op clearly states where the pinholes are and also that he explored the idea of replacing the steel lines with soft hoses. The very first post no less!!

Either too much, or not enough covffee…...

 

[Hugo Habicht]

You can get whatever end you need to weld onto the tube.

I typically reuse the fittings of the old line. Cut off the pipe at the fitting and drill out the rest.

They should be strong enough and fit perfectly to the tractor side (one side of your pipe seems to be thread, but the other fitting looks non-standard). You may have to drill the hole slightly bigger if the new pipe has higher outside diameter due to the increased wall thickness.