To ad to your list

Second Gen:

Standard ABS
RS seatbelts 85+
Different window regulators
They used a solid state transistor with a huge heatsink to control heater blower
300mm brakes instead of 274mm
Different automatic climate control system
Electric headrests
Automatic heated outside mirror
Letters around headlight switch illuminate
Water heated windshield with thermostat
Motorized steering column adjustment
Recirculation mode on climate control
Tilt sunroof (never ever EVER use the tilt feature)
Updated dome light with seat belt warnings

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1981 300SD 512k OM603