65mm Square Section Plastic Downpipe Offcuts (Bedford MK43)

We need offcuts of 65mm or 68mm square black downpipe to insert in ours as a coupling section.

We're setting up water butts. We've bought square plastic rainwater diverter kits. They fit 65-68mm downpipes. Having cut our downpipe we discover it's 70mm. Nowhere makes kits for 70mm square downpipes.

The maximum length we need in total is 800mm but 8 shorter sections of 10cm will be fine.
Can you help with this request?
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