The 119 base engine (V8) was also used in the E420, S420, S500, and SL500 (possibly more too, but these are what I know) the next three numbers get more specific (displacement, etc). For example the 974 is the E500. 119.975 is the E420, and 119.960 the SL500 and so on -various incarnations of the same base engine modified for application and varrying in displacement (slightly) I have no idea what teh 12 and the last 6 numbers signify.

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Jason Priest
1999 E430
1995 E420 - retired
1986 420SEL - retired