Toilet Paper dispenser problem

Doing a bathroom remodel. The toilet paper dispenser was originally a ceramic, recessed holder which we removed. We had a 'professional' tile setter install large format tiles. He tiled around the existing wall opening which is 6.5" square. We purchased a standard paper dispenser and discovered it requires a 5.25" square wall opening. In researching online, I now find that is the standard. I wish the tile setter had discussed the size of the opening with us, but he didn't. Large format tile was used.
My questions are: (1) should I call him back and make him correct the size and if so, should I expect a charge to do this? and (2) Does anyone have suggestions on how to remedy this situation? I found a ceramic dispenser which says it needs a 6" square opening and

the overall dimensions are 6.5" so that would not leave any wall to attach it to.

 

Fixtures like that really should have been on hand if you were providing them, but what he left you with should have been discussed. So its really a 50:50 problem, imo. It baffles me where the hole size came from, or why he would even leave an opening. I probably would have tiled right over it, leaving you the option of surface mount or cut it open later.

 

I agree. Since a dispenser like that is part of the tiling job and gets grouted in with the tiles I should have been on site to be installed. Both you and the installer made a mistake so I'd let it pass and just come up with a solution.

Me, I have a metal shop so I would fabricate a holder of brushed stainless to fit the spot. If you are a woodworker you could make a wooden holder to fit that space. You can also look online and at vintage and reclaimed stores in your area for a holder that will fit the opening you have. And, then the last option is to remove and replace the tiles to fit whatever holder you choose.