My friend recently removed the headliner in his 93 Z28 Hardtop and noticed that the roof is setup for t-tops, only it's just not cut. I don't believe our cars are the same way but I just thought I'd ask. Personally, I'd still never trust it. That's why I have two cars so I can have both.

 

That is the Roof Structure bar.. So your Roof don't warp underload...T-Top Cars have it too....

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1987 IROC-Z
G92, LB9 305 TPI, 3.23, Bright Red with Carmine Interior, Pioneer DEHP47DH CD deck.2 JBL DS645 4*6 (F).. 2 JBL DS965 6*9 (S).. Soon to get new 305 TPI

 

The 93 on up cars were designed as TTop cars. The hard top cars are TTop with sheet metal covering the TTop area. Prior to 93, I don't believe GM was designing the cars this way.

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87 IROC 350 TPI with less than 10k original miles
93 Z28 Pace Car #494 of 645
86 Olds 442 (All Original)
My IROC Website
Northstar Camaro Club of Minnesota

 

Yea, that's what I had thought. But I think that was a good idea by GM. Makes it much easier to put t-tops in a "hardtop" car.