This pulley's name or part number?
 

This pulley seized. Caught in time, was starting to eat the belt. (Guess I found the source of the whining sound eventually).
Looking in the past catalogue I can't find the right pulley, they're all called idler pulley. It's the one with the smooth surface, pointed at in the pic. 4.0 with AC.
It's name, or part number, would be great so I can order a new one.
Thanks in advance.

https://www.sparesbox.com.au/engine-...BoCLDgQAvD_BwE

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Any parts store will have it

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yup an idler pulley, normally you can just replace the bearing depending on which brand it is (and if you have access to a press)

:0=Can you take the pulley to a bearing supply place H? If so the bloke at the counter should be able to give you the correct bearing even if he can't see the number on it. Hammer & socket, knock old bearing out, new one in. Take note of where the old bearing sat in the pulley so you can set the new one the same. They're not a super tight fit, socket needs to be a fraction smaller in o/d than the bearing. 1 beer operation mate.:0=

BEER!?
_____ooooo
/__l_l_,\____\,___
l_---l_l__l---[ ]llllll[ ]
_.(o)_)__(o)_)--o-)_)

Better still, use the stock XJ jack and the uni-body chassis rail as a mini press.