The onBoard 35 Adjustable infant car seat base model IC240 is compatible with any onBoard 30, onBoard 35, onBoard 35 Air, onBoard 35 Air+, and onBoard Air 360 car seat model. NOTE: These bases are NOT compatible with the onBoard 35 LT models.
The onBoard 35 LT Adjustable infant car seat base model IC289 is compatible with any onBoard 35 LT car seat model. NOTE: These bases are NOT compatible with the other onBoard models noted above.
Below is a helpful image to determine which base might be compatible with your car seat model.
Please note – as new models are released, their specific model # may not be indicated on the chart. If you match the car seat model name and base name/model #, however, you will have a successful base/car seat match.