It really doesn't matter what they say about boat length, it's the capacity of the pump that's important and the Viking 32 has very similar specs to the original pump,.
On the plus side, it's a lot less expensive, easier to get spares for ... we had to make a new mount for it which I made out of a nylon cutting board by drilling holes in the appropriate places...oh and the inlet and outlet hoses are bigger than the original, so I swapped the outlet for the manual pump and used an adaptor at the hose end of that to keep the same bore from the sump through the Viking pump to the outlet.
We've had it for nearly 2 years now and it's working fine.
