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The cover underneath my 4.2 XKR barely covers the steering rack and definitely does not cover the transmission. Whereas 5 liter cars seem to have an extended undertray that covers more.
Of course there’s always the possibility that something previously fell off on my car, but consulting the “world’s best repository of detailed pictures of sometimes obscure cars” aka Bringatrailer’s completed auctions listings (lol), it would appear that my car looks exactly like several other 4.2s that I checked.
The OP only asked what panels are supposed to be in place and the answer is 2 more than, no less than 2. As for that they cover the OP didn’t ask but I reckon what the cover, like anything else, can be a matter of opinion.
But yes, there are many pics of 4.2 X150 bellies to be found through searches. I have some of mine somewhere if I can find them.
Very Interesting! JaguarXKR thanks for originating this thread...especially for posting the photo. Mine doesn't have one either. It looks like it would need to be removed to access the oil drain plug as well as oil filter. Previous owner must have left it off.