BrickLink - Part 6538b : LEGO Technic, Axle Connector 2L (Ridged with x Hole x Orientation) [Technic, Connector] - BrickLink Reference Catalog
LEGO PART 6538b Technic Axle Connector Ridged [with x Hole x Orientation] | Rebrickable - Build with LEGO
LEGO 6538b 4177258 Pearl Light Gray Technic, Axle Connector 2L (Ridged with x Hole x Orientation) | electricBricks : LEGO set and parts shop and database
LEGO® 6538b 653826 - 4113805 - ToyPro
Flix-Brix.de - LEGO® Ersatzteile, Einzelsteine, Minifiguren und Sets (FlixBrix)
LEGO part 6538b - Trans-Red Technic, Axle Connector (Ridged with x Hole x Orientation) at BrickScout
MOC Bausteine Technische Teile 40 stücke Technische KREUZ ACHSE, ERWEITERUNG M/3 RIPPEN kompatibel mit Lego 6538b für Kinder Jungen Spielzeug|Modellbau-Kits| - AliExpress
LEGO 6538b Technic Axle Connector 2L (Ridged with x Hole x Orientation) | eBay
Lego Technic Part 6538b Axle Connector 2L Ridged x Hole x Orientation Blue x1 | eBay