aaronmorris
Head's a shed
Don't use copper, especially on something like a 90.
LMA Stainless Steel Braided Pressure Gauge Pipe - Demon Tweeks
Sure you will find cheaper/better, just an example.
Fit and forget, and no stress about trying to get dash back in without kinking copper pipe.
Or failing that use the nylon pipe.
Yeah I had seen those pipes as the copper thing did get me thinking. (It's hardly a normal lr engine )
As I say, Can't make a decision on what to do for the best.