[Tribute Automotive]

Nick, try these:

http://www.ebay.co.uk/itm/PitKing-Pr...EAAOSwofxUfQ7C

Expensive, as the price show is for one only not a pair, but very nice quality.

Or something like these:

http://www.ebay.co.uk/itm/HEAVY-DUTY...4AAOSw-vlVkrX6

Both can be height adjusted to make sure the back edge of the bonnet sits level.