Disco 1 A/c pulley

I have a 200tdi 92 discovery with air conditioning fitted, trouble is the shielded idler/tensioner pulley decided it wanted to get off and walk Leaving the belt, bracket & what’s left of the bearing, so I have no idea what size it is, any ideas would be greatly appreciated, or a spare pulley
All I know is it’s a DIavia system.
Many thanks

Hi the pulley comes complete with tensioner arm and is part number 614718
Pulley-tensioner ancillary drive,
I can check the diameter tomorrow but as I said it appears to be a complete unit,

+1 on the above, it fits a few engines so no issues in getting one

https://www.lrdirect.com/614718-Pulley-Tensioner-3.53.9-V8-Fan-Be/
https://rimmerbros.com/Item--i-614718P

Hi thanks for the replies, but mine is not a landrover a/c, it’s a diavia(Delphi, then eberspacer now webasto owned) unit so is a different set up, have been on webasto site & think I have found replacement, but thank you all

I will take pictures at weekend and put them on