If you do a search on here, you will find many and varied opinions on which to go with. After a bit of reading, and looking at price, I went rubber and are thus far happy with them.
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Super Pro are nice and soft and often a better choice for a classic style coil suspension Land Rover as their design is better, eg. lower rear trailing arm to chassis bush.
For a D2 I'd probably stick to genuine as they are so nicely designed.
Land Rover's QC seems sadly lacking in their genuine classic bush's over the last few years too.