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mi7rennie
You usually find those goggles on 35mm lenses (or wider) for attatching to earlier models (m3) as it had 50mm famelines and longer, this converts the viewfinder to 35mm, but as you have an M4(?) i presume its to do the opposite and magnify. These are usually attatched to the lens that they are for via a ring that it slots into and is then mounted to the camera.
The big chunky thing is as stated an adapter to turn it into an SLR. Dont really see to many of them about so may be quite rare!