Jon over at Living for Sail on YT just restored his with some replacement parts from them including a new motor which I believe is bidirectional. However, his looks different from yours, so may not be the same model. It is the same as what we have on our 47, V3000 I think.
As for replacements, I believe that Maxwell still manufactures in NZ, though they were bought by Vetus a number of years ago. They sold their tooling and spare parts business to a company in Australia. It helps, at least on our boat, that the older VW series is basically the same footprint as the Nilsson as that's what they were based on, so it will fit the raised, molded in platform on our boat. It's what I plan to replace ours with as I would rather get something newer with greater parts availability. They have gone up in price substantially over the last few years...
Kenyon