Need new fourtrak turbo but which one ??

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Hi all
I have a 2.8 fourtrak engine in my landrover and the turbo has been leaking oil since I got it (2 years ago) and have been advised to replace it , I have looked online and there seems to be a few for the fourtrak, how do I find out which one I need Unknw Engine number (DL-51. 534592 )I think it was made between 1985-1991
Thanks for any help in advance
Paul