The HVAC system in RHD is a mirror image of the 97-01 LHD. The fan Spins the opposite direction so the vanes are angled the other way. The fan housing/mounting is also mirrored. You can see the differences if you compare to the LHD pics on rockauto.com to the ebay item linked below.
The only one I can find with stock is on ebay
https://www.ebay.co.uk/itm/HEATER-BL...3088#vi-ilComp
It's title states it's for 98-01 RHD XJs. The vehicle compatability list they have is wrong, listing XJs from 84 to 01. The fan will fit 97-01 RHD XJs and 97-06 RHD TJs.
LHD TJ fans changed to an under dash fitment in 02 so LHD have two fan types available. The RHD HVAC system stayed the same throughout the entire run with the fan accessed from the engine bay behind the battery.