front "chin" spoilers

[culp71]

so, how can one tell if car originally had the front "chin" spoilers?
how many did/ didn't.
is there anything else that could dictate if it had, or should, or shouldn't have them.
like also having a gullwing spoiler, etc.
71 'cuda (hardtop 340/727 yellow w blk billboards.)
also was this only a factory/ dealer or did many add these later?
http://www.ebay.com/itm/1970-1971-Plymouth-Barracuda-Cuda-Front-Chin-Spoilers-New-MoPar-/370946951601?hash=item565e2949b1

[anlauto]

It would be on your broadcast sheet. They were an extra cost option just like everything else and NO you did not get them automatically with the rear spoiler.