Essential Medical Supply Locking Molded Raised Toilet Seat without Arms
Locking Raised Toilet Seat solves your needs for a riser that fits the elongated and standard toilet.  5" rise make it easier to get on and off toilet.  Perfect for hip and knee replacements.  Molded construction supports up to 300lbs.  Very compact for tight spaces.  Seat will lock securely on bowl and allows for easy removal for privacy.