LEGO part 737ac04 - Red Plate, Modified 2 x 4 with Train Coupler Open for Magnet with Blue Magnet Coupling, Train - 8mm Cylinder (737a / x547a) at BrickScout
LEGO Sets with Part 3176 Plate Specialty 3 x 2 Tab with Hole
LEGO Train Coupling Plate with Short 6mm Blue Magnet | Brick Owl - LEGO Marketplace
LEGO Sets with Part 3176 Plate Specialty 3 x 2 Tab with Hole
LEGO Heart Coupling Valentines Day Charm 2x3 Plate with Hole - YOU CHOOSE | eBay
STL file Lego heart keychain・3D printer model to download・Cults