Hiya Cobber,
Dunno about factory but I fitted an AP series (AP-60 I think) after market jobbie to my first GQ and it worked faultlessly. Was still going strong when I sold her about 140,000 K's later.
Only took a couple of hours to fit and was less than $200 back then in 2007.
Worked fine towing as well, which is handy on the big flats over here in WA






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