louver doesn't fit

I bought a louver, stating that it fit a 87-89 Z31. Got it off craigslist. Unfortunately found out its way too short. Is there a major length difference between years, or between 4 seat and 2 seat models, or maybe this doesn't even fit a Z31? I want to re-sell it to get my money back but need to identify what it will fit.00P0P_6VKS04X9mm2_600x450.jpg00A0A_kKH8v89qTAH_600x450.jpg00P0P_6VKS04X9mm2_600x450.jpg00A0A_kKH8v89qTAH_600x450.jpg