Wow, they've done it again! When the correct part (at least according to the book) doesn't fit, CAP can find the right one, every time.
CAP found a perfect fitting gas cap for my newly-acquired '70 Camaro with a rare, thinner, California-compliant gas tank filler tube. One of the helpful sales staff at CAP found a Vernier caliper to make a measurement, and got out a paper catalog to thumb to the hundreds of gas caps and found one within a minute that had specs that would fit. This is not something a computer can do. At that point, it only took an hour to get the gas cap delivered from a local Las Vegas warehouse.
Awesome parts shop.