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Unfortunately I do not think they can be, not without getting adapters made anyway which would chew up back focus distance. The OAG that is designed for the new filter wheels does not have a thread on the camera side.
The only way that I can think of to attach it to an older FW that has an M42 threaded input would be to get an adapter plate made which screws in to the filter wheel and the OAG bolts to the other side of as it is designed to do. Aside from the back focus consumption, the adapter would probably cost as much as a new OAG. That or if there is someone you trust to do it, drilling and tapping the cover plate of the FW with the correct threaded holes and then have it re anodised? That would be a job needing precision or it could turn in to an expensive mess.
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