These are the AMG parts you could buy individually back then for a W116. Cant find mechanical options but remember seeing 6.9 engine mods were about 50% of purchase price AMG W116 Part Numbers
Part
Part Number
Aerodynamic Enhancements
Front Air Dam
7880004
Side Skirts SE Models
7880067
Side Skirts SEL Models
7880071
Rear Deck Lid Spoiler
7880010
Rear Skirt
7880097
Body Kit (Air Dam, Side and rear skirts & rear spoiler)
7880860
Performance Enhancements
2.65 ratio Differential (ABS,LSD)
7350016
2.82 ratio Differential (ABS,LSD)
7350019
3.06 ratio Differential (ABS,LSD)
7350022
3.27 ratio Differential (ABS,LSD)
7350027
3.46 ratio Differential (ABS,LSD)
7350030
Suspension and handling Enhancements
Lowered Suspension Kit (4 springs and AMG gas pressure shocks)
7320053
AMG Wheels
7 X 15 Silver Centre, C-Type (5 Spoke) 15mm offset
7400039
8 X 16 V1 Silver Centre, (5 Spoke, deep spoke design) 11mm offset
7400117
8 X 16 V2 Silver Centre (5 Spoke) 11mm offset
7400100
8 X 17 Aero, Silver 11mm offset
7400097
Tire and wheel combinations
215/60R15 Eagle GT 7 X 15 (Gatorback)
7400839
225/50VR16 Eagle GT 8 X 16 (Gatorback)
7400800
235/45ZR17 Pirelli P700 8 X 17
Unknown
Interior/Exterior Appointments
Shift Knob
Zebra Wood Manual
7810003
Zebra Wood Auto
7810004
AMG Trunk Lid Emblem
Chrome Finish
7810008
Matte Black Finish
7810009
Gold-Plated Finish
7810903