CM367A - Aluminium Anode - for use in salt and brackish water.
Transom mounted aluminum anode for boats with OMC outdrives and Johnson/Evinrude outboards that require additional protection.
Dimensions:
Length: 195.58mm (7.700in)
...

CM367M - Magnesium Anode - for fresh water only. Not recommended for salt or brackish water. 
Transom mounted magnesium anode for boats with OMC outdrives and Johnson/Evinrude outboards that require additional protection.
Dimensions:
...

CM821629KITM - Magnesium Anode - for fresh water only. Not recommended for salt or brackish water. 
Fits Mercruiser Alpha One Generation Two Sterndrives
This kit contains:
• CM821629 X 1
• Mounting Hardware
Dimensions...

CM821630KITM -
Dimensions:
Length: 170.94mm (6.730in)
Width: 201.93mm (7.950in)
Depth: 0.00mm (0.000in)
Categories: Sterndrive Anodes, Sterndrive Anode Kit, Martyr Anodes, Mercury / MerCruiser Anode

CM821631KITM - Magnesium Anode - for fresh water only. Not recommended for salt or brackish water. 
Fits Alpha One Gen 1 and Alpha One Gen II sterndrives.
This kit contains:
• CM821631 X 1
• Mounting hardware
...

CM821631M - Magnesium Anode - for fresh water only. Not recommended for salt or brackish water. 
Fits Alpha One Gen 1 and Alpha One Gen II outdrives.
Dimensions:
Length: 101.60mm (4.000in)
Width: 76.20mm (3.000in)
Depth: 38....

CM3852970M - Magnesium Anode - for fresh water only. Not recommended for salt or brackish water.
Dimensions:
Length: 101.60mm (4.000in)
Width: 27.94mm (1.100in)
Depth: 101.60mm (4.000in)
Categories: Sterndrive Anodes, Bar...

CM3852970Z - Zinc Anode - for salt water use. Not recommended for fresh water.
Dimensions:
Length: 101.60mm (4.000in)
Width: 27.94mm (1.100in)
Depth: 101.60mm (4.000in)
Categories: Sterndrive Anodes, Bar Anode, Bracket Anode...

CM823661M - Magnesium Anode - for fresh water only. Not recommended for salt or brackish water.
Dimensions:
Length: 43.18mm (1.700in)
Width: 25.40mm (1.000in)
Depth: 43.18mm (1.700in)
Categories: Sterndrive Anodes, Engine...