Jul 24, 2018 - 09:28 AM
Thank you for contacting Bio Bidet Customer Support!
We do require specififc measurements for any Bio Bidet unit.
Bolt to bolt must measure 5.5"-7.5", bolt to tank clearance must be at least 1.5".
Elongated style must be from bolt to the front of the toilet bowl 18-1/16" & round must be 16-1/16".
Here is our size chart with a diagram: https://biobidet.com/pages/toilet-typ...
If you are concernd that the round style will be too small, you may want to consider purchsing an elongated base.
Bio Bidet Customer Support