I used my build sheet, cross referenced multiple parts sites to determine Spicer 5-1310x are to be the correct model for my 2003 Jeep Liberty Sport. Installing I noticed a lot of side to side, up & down play. I took it for a test drive and have a horrible vibration below 10MPH, I did not attempt going further and returned home. I believe this is the correct one has mine has cast mark "SPR 539" as indicated at the bottom of the page. Measuring cap end to cap end is 3 5/8 which equals 3.625 as shown. https://www.northerndrivetrain.com/product/SPI-5-1330X.html Lesson learned, trust my initial instincts. I though all along there was way too much play to be normal. Luckily there's a casting mark for reference.