In this video the caregiver will learn how to install the toilet mounted Toilet Seat Riser with Arms. This may be a good option to accommodate for both improving the height of the toilet as well as having handles for upper extremity assistance when getting on and off of the toilet.
The riser demonstrated above mounts under the existing toilet seat and bolts to the back of the toilet. It comes with hardware, though some may not.
Vive Health Toilet Seat Riser with Arms
see product link for further product details