Panel 1 x 2 x 2 - Solid Studs with Utility Arrow Pattern : Part 4864ap03 | BrickLink
LEGO 4864 Castle Set Parts Inventory and Instructions - LEGO Reference Guide
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LEGO Panel 1 x 2 x 2 with Utility without Side Supports, Solid Studs (4864) | Brick Owl - LEGO Marketplace