Model: S4139
Adjustable Back Upright

• 2.75" wide
• 0.25" thick
• 3.25" ratchet height adjustment
• 130 degree angle
• 6 - 8mm threaded holes
• Works with S3608, S4369, S4370, S4400, and S4415 mechanism
• Black

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Model: S4623
Adjustable Back Upright

• 2.25" wide
• 0.25" thick
• 3.25" ratchet height adjustment
• Flat
• 2 - 8mm threaded holes
• Works with S4118, S4194, and S4386 mechanism
• Black

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Model: S4683
Back Upright

• 2" wide
• 0.25" thick
• Plastic insert for back height adjustment
• Works with S4093-3 mechanism
• Black

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​​Model: S4513-5
Back Upright

• 2.25" wide
• 0.25" thick
• 3.125” horizontal slot and 3.875” vertical slot
• Works with S2492-A3 hinge and S2886, S3974, S4857-A6 mechanism
• Black
• MADE IN THE U.S.A.

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Model: S4793-2
Back Upright

• 2.25" wide
• 0.25" thick
• 172 degree bend
• Works with S4118, S4386, and S4149 mechanism
• Black
• MADE IN THE U.S.A.

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