I'm planning to make a set from geotextile material. I was measuring up earlier today while checking the grease nipple threads for a remote greasing system ( 1/4 UNF on the stub axle, 1/8 BSP on the top). I'll post some pics when it's done...
Ian

3.7 Roadster
4" Ruston Procter SD Tractor
1905 Merryweather steam fire engine