The Baby Jogger City Select Front Position Brackets mount above the stroller's front wheels to convert your stroller into a double. This set includes two brackets, one for each side of the stroller. This does not include the seat itself.
The Front Position Brackets are also included in the box if you buy a Second Seat Kit. If you don't need a Second Seat, but wish to use the stroller with its first seat and an infant seat adapter or with its first seat and bassinet, you can purchase these Front Position Brackets separately, which are sold in a pair.
Once mounted on your City Select stroller, the Front Position Brackets can accommodate a stroller seat, an infant seat adapter, or a bassinet. The Front Position Brackets install on your stroller very easily and quickly.
If you are buying the Second Seat Kit, you do not need to purchase these Front Position Brackets -- they are included with the Second Seat Kit.