Sparco High Quality Aluminum QRT Seat Bracket Side Mounts Steel Black 600QRTAL Sparco™ QRT Aluminum 90-Degree Side Mount (600QRTAL) by Planted Technology®. The Planted Side Mount is an "L" shaped bracket sold in pairs (left and right) used to install side mount seats. Side mount seats have the mounting holes on the side of the seat rather then the bottom so a Side Mount or similar product is required for installation.