Yeh true said frank I just bought turbo line off eBay, I have got a banjo bolt never fitted it on my turbo ? I'll try that and use my other bolt for engine block might work ?it should be 1/8 bspt really mate (tapered thread) and we dont know if your pipe has swivel fittings (convex/concave)
you would have been better to use a pipe with banjo fittings really (like mine) so that you dont have thread leaking issues, and you only need 1 banjo bolt each end