The server I have is the HP ProLiant DL380p Gen8 25 SFF Configure-to-order Server 665554-B21. the manual lists these for my product code. HP 2U Large Form Factor Ball Bearing Gen8 Rail Kit with CMA 663480-B21 HP 2U Small Form Factor Ball Bearing Gen8 Rail Kit with CMA 663478-B21 QuickSpecs HP ProLiant DL380p Generation8 (Gen8) Additional Options c04123238 - DA - 14212 Worldwide — Version ...
HP ProLiant DL380e Gen8 Base - Xeon E5-2407 2.2 GHz - 8 GB - 0 GB overview and full product specs on CNET.
HP 2U Small Form Factor Ball Bearing Gen8 Rail Kit with CMA 663478-B21 Either the ball bearing or easy install rail will work fine Partsurfer.hpe.com also shows the spares code for a rail kit
Refurbished HP ProLiant DL360e Gen8 8-Port (Configure To Order) ... HP Proliant DL380e DL380p DL385p DL560 G8 SFF Sliding Rails. ... HP MSA2000 P2000 Rail Kit.