Reviews are everywhere. They fit my 2013 F150. like some people bought them for transmission bearing clearances and all sorts of other things. This set contains 2 seal packs, each containing approximately .340 seals. Each pack of spacers has a left and right spacer of about .050 or .075, one of which has a lip to hold a bundle of thin .005 spacers. Select the left pad, add some thin pads and pick up the right pad. . Measure. Install another pack of seals for the other side of the trunk. Install differential. See how it works. It took me about 3 tries to get the correct clearance when the original factory discs didn't fit after the rear was rebuilt. Check your ring/gear clearance against the specifications. Purchase tooth marking paste to check the pattern on your ring. and pinion afterwards.