Ok I looked at my car.
I assume you are installing an adjustable prop valve?
I used a union, another 14.5mm fitting with a short flared piece in it to make a seal, then drilled and tapped the fitting and installed a heavy wall steel 1/8 pipe nipple between the fitting and the prop vavle.
I know it sounds a tiny bit ghetto, but it the only 'bolt on' way to do thus I have ever found outside of a custom machined fitting. Its been on my car for probably 10 years now with no problems
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