We have 4 used 3" I.D. Steel Axle Clamp Rings.You might be able to use these. Recycling one ton of cardboard saves over 9 cubic yards of landfill space. Alaska and Hawaii usually cost about double.
Wehrs WM293 Suspension Limiter Chain Clamp 3in Axle Clamp Steel Black 2-Piece
4 Link Axle Housing Bracket for 3.5" Axle Tube 4 PACK
Universal BLUE 4PLY 2x Straight 3.5"-4.0"ID Silicone+ 4xStainles Steel T-clamp
Universal RED 4PLY 1x90 Degree 3"-4"ID Silicone+ 2xStainles Steel T-clamp
4 Wehrs Machine WM200-9CB Steel Birdcage Clamp Brackets
Senneker 3" Axle Clamp-on Arm Bracket with Teflon Insert