I like HQ-HJ stripes, just no fan of HX-HZ stripes.
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I just looked at the HG and HQ commercial vehicles order forms. LH side mirrors were mandatory on commercials in 1970 and 1971-2 in QLD, VIC, TAS and WA. HJ would be about the same. I looked on buickzz's broadcast sheet but I can see drillings for the LH side mirror, so my guess is dealer fitment.
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