Disco 1 Help with chassis and engine number

Can anyone help? I found a translator for the VIN but interestingly the digit related to the engine is not listed. Characters eight and nine of the plate are the engine and gearbox type. On my VIN it's 73. The 3 is correct - 3 spreed auto, but the 7 for engine type is not listed. I might have expected a 6? Any ideas?
Secondly the engine number starts 19L which I think is 200tdi?
Any help appreciated.. thanks.