Thank you for your question, and I am sorry to hear that you are experiencing an issue with your Delta faucet. The hole size for each hole should be 1 5/16"~1 1/2" (33~38 mm). Here is a link to the technical specifications for this unit:
Unfortunately, there is not a repair part to fix the hole being larger than the required hole size. I do apologize for any inconvenience this may cause.
Date published: 2018-04-10