This one is easy to tell by the black plastic antenna mast tip.
Quality aftermarket antenna mast as shown. Comes with instructions on the packaging.
1992-99 W124 W140 R129 Aftermarket Antenna Mast for Original Hirschmann Power Antennas
$28.00
SKU:
ELT-OE140HIRSHMANN 
Product Details
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$29.75
SMOOTH Antenna Mast Cable for Hirschmann Power Antenna W116, Early W123, Early R107 and Early W126
Up through approximately 1983. Confirm you antenna case type. Includes written instructions by Kent Bergsma.
IMPORTANT NOTE: We do not sell replacement antenna masts by year and model. We have run across too many problems with confusion, interchangeability, and previously swapped antennas. We sell a SMOOTH TAIL mast and a TOOTH TAIL mast.
$22.50
TOOTHED Antenna Mast for Hirschmann Power Antenna W123 W126 w/INSTRUCTIONS
DOES NOT FIT WAGONS OR COUPES -- SEDANS ONLY - What the video below to confirm the type you need.
IMPORTANT NOTE: We do not sell replacement antenna masts by year and model. We have run across too many problems with confusion, interchangeability, and previously swapped antennas. We sell a SMOOTH TAIL mast and a TOOTH TAIL mast.