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Yes, cut to fit the A/C void.
You would still want to cover and seal in the same manner as the other insulation, the vapor barrier is to isolate air movement through the wall.
I mentioned the foam board as it is easy to cut and fit, but even buying a bag of standard insulation is fine, but you may end up with a lot left over.
For the vapor barrier patches, you can use most any plastic. Painting drop sheets 4+ mil thickness would work well, just seal the seams with some proper tape
You would still want to cover and seal in the same manner as the other insulation, the vapor barrier is to isolate air movement through the wall.
I mentioned the foam board as it is easy to cut and fit, but even buying a bag of standard insulation is fine, but you may end up with a lot left over.
For the vapor barrier patches, you can use most any plastic. Painting drop sheets 4+ mil thickness would work well, just seal the seams with some proper tape
