Cloverleaf roadsters. It appears to be a style popular in the late teens/early ‘20s in which the two front seats are essentially buckets with a pass through between them to the rear bench seat. This 1918 Moon 6-45 'Cloverleaf' Roadster shows how they work.
1917 Elcar Model E Cloverleaf Roadster
1919 Dort Model 11 Cloverleaf Roadster
1917 Peerless Model 56 Two-Power-Range Cloverleaf Roadster