I have repro T-top interior panels for the 70. Look really good. They don't fit. Their curvature is not sufficient to fit the arc of the mating fiberglass T-tops. The velcro strips I've added and the stock plastic attaching clips(with the nylon stalk heads) won't hold the repro panels in. I've thought about draconian measures to glue them in. Haven't done that yet. Actually, I can get the passenger's side to hold. The driver's side falls out. The stock T-top liners had a paper/fiber mache substrate. The repro liners have a black plastic substrate. I've been told to wait for a warm day, put them upside down in the sunlight and blast them with a hot air gun (hair dryer) to soften the plastic, and then stick them in. Haven't done this yet.
My general rule:
1) If a repro part appears to be of good quality, it won't fit.
2) If a repro part fits, it'll be of poor quality
3) It is possible that a repro part will be of poor quality and won't fit.
THERE ARE EXCEPTIONS to the above. There are some repro parts that are better/equal to OEM quality and will also fit. I think that repro parts that are actually produced by specifications of Dr Rebuild will fit the exceptions. To make a short story, there are a few repro parts I have bought that do fit and are equal/better than factory. Some fittings in stainless steel, Quanta fuel tanks, DeWitte radiators, Al Knoch, Trim Line, etc and sometimes from the typical Vette vendors. .......However, the EXCEPTIONS are in the minority of repro parts offered for sale.