Bed Frame Support Parts and Retrofits (2026)

Last updated: July 30, 2026

Centre support legs and replacement slats for fixing an under-supported or wide-slatted frame.

We list no prices. Prices move constantly and Amazon shows the current figure — what we can usefully tell you is which specifications protect your mattress. See how we evaluate.

Retrofit

Any brand Adjustable Centre Support Legs

Adjustable-height steel support legs with non-slip base, per-leg capacity stated by vendor

Adds the centre support that queen and larger frames require, on a frame that shipped without enough.

Best for: Retrofitting an under-supported queen, king or California king frame

Watch out: Per-leg capacity figures vary widely by vendor and are often stated without a test standard - check the specific listing rather than assuming a category figure.

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Retrofit

Any brand Replacement Bed Slats

Wood or steel replacement slats, sold by size and count

Lets you close slat gaps to the roughly 3-inch maximum most foam warranties require.

Best for: Frames whose original slat spacing is too wide for a foam mattress

Watch out: Adding slats narrows the gaps but does not increase the frame's weight capacity or add centre support.