I have just removed my pump and all the bearings and seal was very easily obtained at local bearing store,
Seal WTK T01 12mm X 24mm X 7mm
These pumps are really very easy to service
if you have any workshop tools, if you have an impact gun removing the pulley is a breeze just hold it and rattle away Note 1/2 inch socket same on retaining bolts holding pump to bracket.
Hint see below re modifying seal for salt water
, agent at bearing store said even stainless seal retainers fail reasonably quickly in salt water
However using this method normally gave far better longer life results. See option 6 and yes it not exact same pump but all pumps really are the same in simple terms, will will do this method to my pump and let all know how it went.
the yanmar pump is much simpler than this one.
Changing the Raw Water Pump Seals on the MD2030 | Engines | How To Articles | Manta Owners Association
Hope this is of some use
Let me know ASAP if anyone sees any problems here Thanks