Ta Ged. Yep, one of the last SSDs that went to Australia. 260 in 1980, 126 in 1981 according to Ian Falloon (who used the factory records.) I know of 3 others, the closest being 952002 (frame) + 905841 (engine).
Have you got any more precise info on the build and/or rego date? I noted that you said it was a 1980 ...
P.s Reckon you're gonna end up re-painting that frame ..