Here are link to a number of related threads:
UK suppliers
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Wiring help: link to
http://www.autosparks.co.uk/ and
http://www.thewiringharness.co.uk/
AUS suppliers
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Wiring help: link to
http://www.vinwire.com.au
US suppliers
-
Wiring rehab: link to
http://www.vintagewiringofmaine.com/
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C-15 Wiring harness topic (old forum): reference to Harness Unlimited, British Wiring (also in the UK) and Precision Wiring
Is this of any help?
Cheers,
Hanno