Hi Guys
Here a 285M/740 cam, not pair, only one cam.
http://www.ebay.co.uk/itm/Lotus-elise-rover-k-cams-1-4-1-6-1-8-Pipercams-285M-740-/110876327977?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item19d0be8029
All the best
Vicente