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Here are some suggestions:
Rubber Grommets
Nylon Cable Ties
Spiral Wrap
Single Wall, 2:1 Heat Shrink Tubing
Nylon Clamps
Dual Wall 3:1 "Magna Tube" Heat Shrink Tubing
Cable Tie Mounting Bases
Split Flex Convoluted Tubing
Clips, Grommets & Bushings