Today I ordered the 22mm id bushes for the sliding hub front suspension.
Although I prefer and actually tried to source these locally in OZ, as so often happens, it was so much less involved, way easier and cheaper to get them from China, via eBay.
My initial preference was to get DU type bushes which have a 25mm OD. Finding tube or pipe with a 25mm (or slightly smaller) ID proved quite difficult.
Closest I found, was some old bicycle frame tubing with a 1" (25.4 mm) id. I considered that the welding of the axle and steering arms (and the appropriate bracing, reinforcement and support might shrink the tube enough to retain the bearing. In my youth, I would have plowed right into this option, just to see if it could work.
Instead........the bushes I ordered have a 30mm OD. This allows many more options for heavy wall pipe etc. and plenty of meat to machine the OD to suit my final selection.
cheers, Daryl.