It’s highly recommended to change the Yellow Fan Greg.
If you plan to take the radiator out, also highly recommended as it will most certainly be like Dave’s picture, it’s very easy, otherwise it can be quite fiddly.
The Black Fan is the same with the Range Rover P38, direct fit and inexpensive.
I got mine a long while ago from Britcar, I don’t remember if it was a Eurospare, but works fine.
Two months ago I changed also the Fan Clutch and put the Hayden 2665 (standard).
The fan fits perfect and no trimming was needed.
I was skeptical about the 2747 (heavy duty), I was afraid it might make a lot of noise.
So far so good with the 2665, albeit summer hasn’t come yet, but it sure moves a lot of air!