→ Match Technical LB-SL3 L-bracket for Leica SL3 and SL3-S cameras (buy at B&H Photo | Leica Miami).
→ Peipro quick-release push-pull L plate bracket holder for Leica SL3 cameras.
→ RRS L-bracket and base plate for Leica SL3 (coming soon to B&H Photo).
Previously reported SL3 bracket/cage/base plate options:
Just announced: new IDSworks modular base plate and L-plate attachments for Leica SL3 cameras
Just announced: SmallRig cage kits for Leica SL3, SL2, and SL2-S cameras