Please help!?!1961 Jaguar, Mark IX fuel sending unit

Has anyone had luck with the sending units that are being sold for the Mark IX?
I have purchased two and haven’t been able to make either one work. The angles and curves are not even close to the original. I would love to know if anybody has had success with these new units and if so, directions on how I can do it, so I don’t ruin a third unit…
Thank you in advance! Any advice or help is greatly appreciated…