why is the cabinet lenght required 36 if the sink is just 30?
A. The Kohler K-5871-5UA3 36" cabinet length is required for under mount installation only.
Because holes are oversized does a standard faucet work?
The Kohler K-5871-5UA3 is an undermount sink, so the faucet would sit above the counter. The holes are 2 3/8", but that will not make a difference as long as your counter holes are the correct size for the faucet.
Can it be mounted on top of the counter rather than as an under-mount?
The Kohler K-5871-5UA3 is intended for undermounting only.
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