Thanks for all the help chaps. Well I spoke to Morgan and they've come back with 2 part numbers for the respective sensors, but of course they are Morgan part numbers not NTK numbers. I know these are NTK sensors and the very fact that there is an excessive amount of cable for the Morgan (a lot of the cable is coiled up on the wiring looms) suggests that they must be standard sensors . On principal I need to find out what they are as I cannot stomach nearly £300 per sensor. The factory have come back with part numbers MEE3068 and MEE3069.