Kowa Super 66 Lens Mount

I doubt it: not because of their diameter, but because they are super- slim so no obvious place for a lens cap to attach to. This said, they screw on and off with minimal effort, so I take them (and the filter system off) off before transporting the camera to a new location.

Will this work on my sony a6000 and tokina minolta 100-300mm macro zoom?

Yes

Too loose/there is gap between lens and adapter ring

If there is ever any more than a slight amount of rotational play, you may want to try tightening the lens mount adapter so it will hold the lens tighter to the mount. There are 3 flanges in the middle of the adapter (what the lens locks onto) that are split open slightly, this gap is what gives the tension that holds the lens tight to the body. Over time and with use these gaps decrease in size, no longer pulling the lens tight to the adapter, which allows the lens to move inside the mount more than it should.
To tighten the fit, get a slim metal object (a #1.5 or #2.0 small flat eyeglass screwdriver is ideal) and insert it into the slit to open it up just a little bit (see images below, make sure to do it to all 3 evenly). The more you open the gap, the tighter the lens will be to the adapter; too much and the lens will have a hard time mounting so make sure to do it just a little bit at a time to all 3 flanges evenly, it doesn’t take much at all to get a tight fit.Note: please do not use too much strength, or the shrapnel will be damaged.

What kind of rear and front caps would I buy to go on this since it doesn't come with any?

I don't think you need any. There is no glass.

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