Based on this product's specifications, here are some alternatives and similar models
FUJITSU Fsas Technologies 6x REAR 2.5" SAS/SATA HDD/SSD module PX-BA26S5 for RX2540 M8 (6x rear 2.5" bays)
Summary description:
This FUJITSU Fsas Technologies replacement module (MPN PY-BA26S5) provides six rear 2.5" bays for SAS/SATA HDDs or SSDs for the RX2540 M8 chassis. Designed for server storage expansion and drive replacement, it enables mounting and hot-swap capability for up to six 2.5" drives at the rear. Suitable for datacenter maintenance and upgrading storage density without altering the main chassis.