Have a look back through this thread and there are some comments I made on the Pirelli AT+ but 18" version, it may help.
Peter
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Update 13/7:
2 new engine mounts (genuine LR140113)ordered from island 4x4. AF doesn't do them which I find interesting, I emailed and got a reply almost straight away, not listed on their site. Rimmers was too dear. Ended up paying 321 AUD delivered to my door for the set. For reference, Rovacraft here in Perth quotes 242 each. Now to wait for the postman then off to my indie for fitment.
Correction on Eric's part number LR014113 | ENGINE MOUNTING-DISCOVERY 4 | Land Rover | | Britcar (UK) Ltd