We want to buy an Ikea bathroom cabinet, we already have a three piece faucet but none of their sinks have three holes or knock outs for 3 holes. They claim we can't buy the cabinet and put a countertop sink on it (from another store that does have 3 holes for the faucet set) despite a photo on their website showing countertop sinks on a different cabinet in the same range.

Can I just ignore them, buy the cabinet and install and countertop sink from another store?!