Made me one out of sheet metal, 0.5 mm aluminium, glued and riveted. Flattened out my oem LHD liner to use as a pattern, just folded it up in the opposite direction to create a RHD version.

Metal meant I could use Rivnuts for the bottom mountings; instead of those split paper pins … also the metal was then an excellent and convenient cathode for the interior flocking. Been a long time since anything I’ve done has worked 1st time so I’m very satisfied; it’s a drop-in fit that imo looks better than the cardboard. So now I’m wondering if I should do similar for the cardboard parcel shelves…
I’ve an unsubstantiated theory about how/why aftermarket parts can be so ill-fitting; it is that Jaguar, when they modified a part for a later series car; if the modified part was backwards compatible they didn’t change the part number. Subsequently the earliest designs were sometimes the basis of the aftermarket parts. As in this case, ok if you’ve got a door less glove box/cubby; not otherwise.