I replied on the cockshutt forum, but I'll post my reply here as well...

The pump is a V120. Both housings are good, although scored, so all I need is the central casting and the impeller with new vanes.
According to the excellent web page... 

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...I can fix it with Cartridge kit #912058 and Seal kit #229236.
My local Motion Industries distributer can get me the seal kit, but the cartridge kit (according to them) is unavailable.

If you have a source for this hard-to-find kit I would be thrilled!

- Robin.