For the 1955 you firstly need a Y dot with the wide date (Perth coin with the 5's in the date further apart). You then check the obverse for (obverse 9 (Perth)) the I's in Gratia and Elizabeth aligning on a gap (and not a denticle as the common type).
For the 1956 you also need a Y dot coin with (obverse 8 (Melbourne)) the I's in Gratia and Elizabeth this time on a denticle. They are about as I have some of each and one of the 56's in UNC.
The link DV put up will show the above obverses. Cheers.
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