Hello GeoffP

This is a common issue.

Fortunately, there are solutions.
If original decals are not available, then the only alternative
is re-manufactured ones.

The Number One decal maker in Australia is eBay's Silensmessor.
http://www.ebay.com.au/usr/silensmessor?_trksid=p2047675.l2559

He should be able to research and reproduce your decals.
Please PM him via eBay.

Hope this helps.
-------------------------
Jack