KronosProducts, based in Glendale Hts. IL claims to be the largest supplier of "premium gyros" They sell enough to make about 300,000 gyros per day
They have what they call cones. They come in 100% beef, beef/lamb combo, or 100% chicken
They are ground, pressed cones, that mount to the roasters. A "true" gyro would be meat stacked on a skewer, but for the sake on convenience, most gyro places around here use the cones. I think it also makes for more consistency in the end product.
I personally have never seen anything but the ground meat cones anywhere in this area, and gyro's are pretty popular around these parts.
I have seen something similar in Mexico, called tacos al pastor with meat stacked on a skewer with a pinapple on top. They trip bits of the meat into a tortilla, and top it off with a hunk of the pineapple