What fits a 40x52x7 TC shaft seal on a SM?

Mike Longcor (SV Trilogy)
 

Hello all,
I'm going through lots of spare parts onboard...
Quick question if anyone knows what a 40x52x7 lip seal might fit on a SuperMaramu? Doesn't seem to match anything related to the bow thruster, C-drive, prop shaft, furling motors, electric winches, etc... unless I'm missing something.
Perhaps just a miscellaneous spare, bought in error, etc..

Thanks,
Mike Longcor
SV Trilogy - SM23
Opua, NZ

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