Based on this product's specifications, here are some alternatives and similar models
PCIe RS232 1-port Serial Adapter Card StarTech PEX1S553LP — 16550 UART, DB9, Low Profile, PCIe
Summary description:
StarTech PEX1S553LP is a 1-port PCI Express RS232 serial adapter card with a DB9 output and 16550 UART. Designed for PCIe host systems, it features ASIX MCS9922CV-AA chipset, up to 460.8 Kbit/s baud rate, 128-byte FIFO and low-profile form factor. Suitable for adding legacy serial connectivity to Windows, Linux and macOS systems in industrial, POS and embedded applications.