X305 Engine mounting bracket

My 1996 Jaguar/Daimler Double Six needs new hydraulic engine mounts (MMD7500AA) especially on the right side. I have learned that they are very expensive (6-700 Euro) if you can get hold of any at all!?!? I’m wondering if anyone has successfully tried to adapt an engine mount from an X308 or maybe something completely different so that it can be used on a V12? If anyone has a good idea I’d love to hear about it. . Thanks in advance!