Jun 17, 2019 - 08:40 AM
Thank you for contacting Biobidet Support.
I am sorry to hear the rubber mounting bolts will not go through the holes in your toielt porcelian. This is a "very" tight fit and you may need to use a rubber mallet to tap in the rubber bolts.
There are some rare instances where the bolts will not fit all mounting holes in toilets and you may need to purchase just a slight bit small top mounting bolts. These mounting bolts can be found on Amazon or any locale hardware store. Please be sure to bring the bidet bolts with you to compare size.
Source: Rubber Mounting Bolts