For the plastic runners, try either
mulford plastics Mulford Plastics | Delivering Solutions | Large Format Printing Suppliers | Plastic Sheet Suppliers
Or
Lep let.co.nz*-*Diese Website steht zum Verkauf!*-*Informationen zum Thema let.
I got some nylatron a few years ago for boat trailer runners, 18mm thick, they cut it to width.
Bloody great and bloody slippery.
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