Per
I took the following codes from id plates under the hoods of my 140s.
They should be the factory codes. Although I'm not the original owner
of the cars, there is nothing that indicates that the upholstry is
not original.

'70 145S Code 824-684; Blue cloth seating surfaces and a navy vinyl everywhere else.

'72 145S Code 865-799; Black vinyl everywhere with a brown carpet.

'72 145E Code 778-787; Dark brown cloth seating surfaces and black vinyl everwhere else with a dark brown carpet.

My personal choice is the 778-787.

Don't recall ever seeing a dark grey.

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'86 745T, '72 144E, '70 145S, '68 122S Estate, '60 544