<After the first three numbers, and following a dot are three more. These are specific to the year.>>
These 3 numbers are the specific model, not year.
126.035 would be 420sel
126.039 would be 560sel.
A 126.045 is a 560sec [coupe] , etc.
All are 126 chassis and all were made 86-91, but they are different models of the 126 chassis.