The problem with the lambo door industry is that there are only three manufacturers that actually make a legit well engineered hinge.
Scissor Doors Inc. Vertical Doors Inc. and
LSD doors out of Germany. The majority of the chaff out there is all made in china out of thinner and cheaper steel and drilled out surfaces that should be machined. When you get that much play in a pivot and at the end of the door its a lot. Those kits are made for most imports and more common domestics. They sell for around $400 usually doing 4 or 5 times that in damage to the car they are installed on. The good new is that If your going to get a lambo door kit for your Camaro the only companies that make a bolt on kit are Scissor Doors Inc. and Vertical Doors Inc. unless LSD has made one since I last checked. So, anyone else claiming they make one is just trying to sell you something universal and cheap.