I thought I should update this thread, in case anyone searches for similar information.  On the XPS 15 L502X I installed a 7mm SSD into the bay that originally held a 9.5mm HDD. While I can add the 2.5mm spacer/adapter that Crucial included with its SSD, I don't think it's required or will add any benefit. As another poster in this forum found, the original drive bracket holds the new SSD solidly and securely once all four screws are tightened.
Hi: I want to remove the original HDD to replace it with a SSD. I read that since L502X was designed for 9.5 mm height drives that a 7 mm high SSD may require use of a 2.5 mm spacer/adapter. On another forum, an XPS 15 L502X owner said that he installed a 7 mm SSD without needing a spacer/adapter, because the original HDD bracket held the new SSD perfectly. Can any XPS 15 L502X owner here confirm that?Have you replaced the HDD with a SSD without needing a spacer/adapter?Or, did it need a spacer/adapter?
XPS 15 L502X: install SSD - is spacer/adapter needed?