No-one ever said they did, how you identify them today has no relevance whatsoever to what they are meant to be, GMH couldn't have given an iota how you identify them today. All that mattered was they had vehicles to sell and made money, end of story. What GMH intended is the ONLY relevant thing: HX and HZ Sandman WERE 100% no argument intended to be seen as a separate vehicle just like an XU1 was intended to be seen as a separate vehicle to a GTR and an SLR5000 was intended to be seen as a separate vehicle to an SL/R - these two shared exactly the same model codes as their base. In fact HX Sandman was even further removed from its base vehicle as it did not even carry the base vehicle's name (HOLDEN) unlike the SLR5000 and GTR XU1 which still carried part of the base vehicle's identity. If all things had gone as intended there most likely would have be no Sandman, we would have had an SS variant which would have been available on sedan, ute and van. Instead we got the Monaro GTS sedan and the Sandman commercials.
8Q37 isn't the model code, nor is 8Q69. These are respectively: the manufacturer, the luxury level and the body style. The actual MODELS in this case are 8WQ69 (HX GTS sedan) and 8WQ37 (HX LE coupe) - again perfect examples of two totally different vehicles sharing the same coding.
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