The short 68 spoiler was in use until about mid March of 69, the long spoiler first appeared around the beginning of February 69 and both were used in the overlap month and a half to 2 months, until the oin and supply of short spoilers were used up. The only group of cars that have never been seen with the short spoilers are the Z11 cars. Everyone of them had the long spoiler from the factory, how the factory managed that is not exactly clear, as the short ones were seen on Z28's, SS's and others during the same production time as the early Z11's. Z10's also have long spoilers, but the plants had used up the excess short ones by Late April, early May when the Z10's were built. Again the length of the spoiler on the car had nothing to do with the dimensions or placement of the stripes on the trunk.