1046, 1037, 1026, 4M-005 Seat Recliner Locking Linkage Mechanism Z-Arms (Reverse Motion Mechanism) Link Mechanism Springs All Associated Hardware Arm "3-5-1" Arm "3-5-2" Middle Pivot Connecting Bracket "3-4-1" Fits Following Models: Fits Model 1046 (mamaRoo 5.0) manufactured 2022 through present Fits Model 1037 (mamaRoo 4.0) manufactured 2017 through 2022 Fits Model 1026 (mamaRoo 3.0) manufactured 2015 through 2017 Fits Model 4M-005 (mamaRoo 1.0 & 2.0) manufactured 2010 through 2015