I use this site to get the part #'s ... other than what the dealer uses it seems to be the most comprehensive parts diagrams: https://parts.jaguarlandroverclassic...nd/land-rover/
However you cannot purchase parts here for new stuff like L663! (I buy tons for my old D2 etc from JLR classic though)

I think it's the best most comprehensive diagrams, then I go to Land Leaping to buy them. Or wherever.

 

I've used https://landrover.oempartsonline.com which uses a "network" of LR sites and gives the lowest price I've seen on parts.
With that said the lowest prices almost always point to https://www.landleaping.com
I've seen when prices change on LandLeaping then OEMPartsOnline will reflect that same price.
The only thing which may differ is the cost of shipping, depending on where you're located in relation to distribution center of https://landrover.oempartsonline.com vs. https://www.landleaping.com

 

this no longer works