In the paint codes on the compliance plate, all I can find are #4 which is black.
#258 Black over Cape Ivory
#259 Cape Ivory over Black
#299 India Ivory over Black
#300 Black over India Ivory.
Unless you want the paint formula which is really no good these days because the Balm paints "DUCO" formulas are not able to be replicated by that formula. The best way is to have panel shop match original colour off the car if possible with new paint types
I have only one other bit of paint info which is GMH Automotive Colours for 1957
Holden Standard Saloon- Black ----DUCO LAQUER ---#253-6258---B.A.L.M touch-up Ref. No. 286-2222
Just some bits of info from some loose pages I have.
Cheers Stewy