Are you sure they aren't same fitment as b-body? I thought mine was normal Caprice. The class II Hidden Hitch bolted right up to my old '95, but sloppier frame welds required grinding to fit on my new '96. And it had the drawbar welded UNDER the crosstube to be truly 'hidden' with a cute little trapazoid plastic covering the tip.
There's an old thread recounting brand consolidations maybe 15 years ago. There's been model no. changes to where I type in mine and get a completely different looking shape.
Class II and III tongue and bearing wts. seem real close so I've never felt risk with mine. I sure wouldn't haul a tandem carfloat with my car even with a Class III but 3,000# of dirt or blocks has not been a problem.
Also - there used to be a guy here lasercutting pieces and shipping loose kits for our car. Worth searching. maybe.
\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear). Finally, wait for it... LT-4 knock module!
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HDFA w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCA, Airlift 1000, Monroe SS, PowerTrax No-Slip, CTS wheels with +1 rubber. Finally, yes again... LT-4 knock module!