Internal I believe, the nozzle on the servo valve was ~12mm so I would guess that was right. The servo pipe from the corsa is thin, plastic (but very rigid) pipe as apposed to rubber hose, so the internal and external dimensions are pretty similar. The diameter is printed on the pipe anyway, so no worries there, and the difference between that and an 8mm pipe should be pretty obvious at a glance anyway.
Try ure local mecedes van/truck dealer.we had some for a sprinter the other week and it comes in metre lengths,got a bit left in work so will measure the diameter,
TBH, the material cost for aluminium at the moment is stupendous. I would have to make it from billet aluminium. My cost to develope it, program, tool up and then produce it would be silly.
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