widespread

Could someone tell me what these extra hose lines connecting the cold and hot valves on this wide spread bathroom sink faucet are for?

I am replacing an older widespread faucet in a granite vanity top with a Kohler ceramic under mount sink. Looks straightforward. But the new (?) design of the Kohler faucet has me stumped. They used to use those hex nuts which were a pain for the amateur but now they have these large oval...

Over the weekend I was going to install a wide spread faucet handle set into a new Crane Plumbing Silkstone vanity top. The holes for the faucets are 1-1/8" the main portion of the faucet is 1-1/4". Called Crane...and absolutely no help. Before I attempt to enlarge the holes, has anyone here...