Axle swivel joint Mot trouble

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Hi all of you far more experienced mechanics!
I have had a fail on my mot because I have excessive play in my offside axle swivel joint. It's an old c reg rocky with a petrol to diesel conversion.
I am fairly capable but inexperienced. Would anyone advise me on the level of difficulty of the replacement, and what I would need to order to do the job myself? Any advice is apreciated.
Thanks