The company was concerned about fitment because MSD packed the new starter with a bigger motor than the factory Jeep starter. The factory starter motor is 3 inches in diameter, while the APS starter is 31⁄4 inches in diameter. Catalina sometimes says something about size and how it matters to her. I don’t know what she is talking about, but when it comes to starters, size almost always matters. Speaking of size, not only does the APS trump the stock one in diameter, but it is 81⁄4 inches long compared to the stock one’s 71⁄2-inch-length.