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Hitachi called them "bellows" not "dust boots". "Bellows" for Hitachi M12V, M12V2 are still available in Australia at toolspareparts.com.au but they cost AUD34, AUD41 respectively.

 

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Hitachi fit Bosch?

If you let me know what is the internal diameter of your broken bellows, I will be able to guess whether it fits. Hitachi has springs inside the columns but so columns will have larger diameters.

Hitachi Trimmer Routers 18V and 36V will fit all the Makita R0700C trim router bases - so there is chance of compatibility. Hitachi guide bushes fit ELU, Dewalt, Trend and Triton - 2 1/2HP and 3HP plunge routers so WE MAY BE LUCKY.