You may find stl files for the carbon tube gantry for voron 2.4 in below link
If you want to buy the aluminum screws nuts and carbon rod for printed parts,please choose the option of screws nuts:
these screws nuts only 20.8g in weight!!
4PCs 5x40mm Pins (Use Carbon fiber rod)
4PCs M5x40 aluminum SHCS
8PCs M5 aluminum Nut
4PCs M5x10 aluminum BHCS
2PCs M5x30 aluminum BHCS