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That might be true, although it is common practice in the car industry today. Even Lamborghini uses parts from various other manufacturers. Why should that be different with motorcycles? It's usually easier and cheaper not to reinvent the wheel.

 

HI , Could you please post a link to the correct metal ones , i can only find the plastic ones , thankyou

 

These are the ones I used. https://www.tom-parker.co.uk/products/cpc-plastic-and-brass-couplings/2/fuel-line-couplings/61/brass-coupling-bodies/150/pipe-thread-valved-male-thread/649/clcd100040v/
Just check the thread size, I know it’s BSPT but can’t remember if it’s 1/4 or 3/8ths My memory’s not what it used to be