LEGO Part 6538b Technic, Axle Connector 2L - Ridged with x Hole x Orientation [Black] (4113805, 653826) | iBricktoys: LEGO shop guide and database
BrickLink - Part x1192px3 : LEGO Technic, Axle Connector 2 x 3 with Ball Joint Socket and Axle Socket with Black Rubber Insert Pattern [Technic, Connector] - BrickLink Reference Catalog
LEGO® Technic Axle Connector 2x3 Quadruple 11272
BrickLink - Part 32174 : LEGO Technic, Axle Connector 2 x 3 with Ball Joint Socket - Open Sides, Angled Forks with Closed Axle Holes [Technic, Connector] - BrickLink Reference Catalog