LEGO part 64424c01 - Black Train Buffer Beam with Sealed Magnets - Type 1 at BrickScout
LEGO MOC Rail buffer with shock absorber by macfreek | Rebrickable - Build with LEGO
BrickLink - Part buffer : LEGO Train Buffer Single [Train] - BrickLink Reference Catalog
LEGO® Train Parts Carriage Wagon Bogie Buffer Truck Wheel - Etsy New Zealand
Amazon.com: HMANE 10Pcs Train Parts and Pieces Black Train Wheels for RC Trains, Train Wheel, Train Buffer Beam with Sealed Magnets Compatible with Lego : Toys & Games