Amazon.com: 2 Pcs Floor Mount Base Plate for 4545 Aluminum Extrusion Profiles, 4 Slotted Hole U Post Carbon Steel Post Base for 45 x 45 T Slot Aluminum Profiles : Industrial & Scientific
Amazon.com: T Slot Aluminum Extrusion 15 S 6 Hole Joining Plate #4366 : Industrial & Scientific
Amazon.com: 6 Pcs 2020 Aluminum Extrusion Floor Mount Base Plate, 3mm Thickness(11 Gauge) Carbon Steel Post Base for 20 x 20 T Slot Aluminum Profiles : Industrial & Scientific
Wide and Flat Aluminum Table Plates | American Machinist
Coupling Plate - 2 Holes - 20x20 Aluminum Extrusion : ID 1217 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
8020, 1010, 10 Series 1 Inch x 1 Inch T-Slotted Aluminum Extrusion DIY Extruded Linear Slot Bar Rail 80/20 (12" Long, Black Anodize): Amazon.com: Industrial & Scientific
T-Plate for 2020 Aluminum Extrusion : ID 1219 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits