Our order was collected this week, have posted three on to mikecambray; many thanks for payment Mike!
Note: rollers £24 each; postage was £14 for 3.
Sizes given in original post proved accurate.
Mine fitted easily; just took a little time to drive the old rubber rollers off their axles/spindles. The spindles had only light surface corrosion, but the old rollers relied on the axles spinning in their brackets; mine did not spin roller on the axle itself.
Well lubed with silicon grease, my new keel rollers now spin freely, like bearings. The roller spins on its axle as well as the axle in the bracket (at the moment!). I think this spin of the roller on the axle itself should be most helpful when loaded, as is a comparatively large bearing area, not edge loaded steel/steel as original.
Other.
Have also "invested" in some "Floatem Poles" docking arms (Ebay winter bargain!).
http://www.floatempoles.co.uk/A possible disadvantage is that the cushions are in "Rail Worker Orange"? My wife seems to think so.
At least no one will be able to say they couldn't see my trailer, particularly when empty. Will help dominate/intimidate when head-to-head in the narrow Cornish lanes.
Will report back after I have used my modified trailer.
PS Aspen fuel in Penryn also; £19/5 L. As good a price as I can find anywhere?