The change seems to be some time around August 75, there were a lot of changes around this time. Early HJ the Portland grey GTS dash was used as that was the only style available. Around 8/75 the black sports dash and a woodgrain sports dash were introduced and from this time on the Portland grey was GTS only, black was Sandman and could be optioned in Holden and Kingswood. The woodgrain sports dash was optional in Premier, LS Monaro and Statesman.
base model Sandman had the 2 air vents on the outside only and were the barrel type unless fitted with factory aircond. In which case it had all 4 vents in the louvre style. Kingswood Sandman Ute came with forced air ventilation and had the 4 louvre style vents.
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