Was going to take this offline to email, if anyone gets bored please ask or look away now. But it may be of benefit for anyone else trying to match sections.
Smithys I must have measured these sections 6 times each today, its close :

The base of the replacement must match pretty well otherwise the double thickness of the pole wrap will be of no use. If its 1mm too small the tip of your lower section will not fit.
Could you please give me again the OD dia of the tip of the section thats going to fit into the replacement.
Then give me again the ID of the base of your original broken section.
Same with the tip -is there any leeway/tolerance ?
I may have a choice of two sections.