Aftermarket fuel pressure regulator for 512TR

Has anyone used these after market fuel pressure regulators on the Ferrari 512TR?
https://spaturbousa.com/products/ferrari-355-456-550-512-in-rail-adjustable-fuel-pressure-regulator-e85-safe-2-units?currency=USD&gad_source=1&gbraid=0AAAAApI_d1gbkxYeSjYe3htS1UutU_1v1&gclid=EAIaIQobChMI49GjjuCJhwMVijQIBR36VwBzEAQYAiABEgKchvD_BwE

Any suggestions? I believe one of my fuel pressure regulators are bad. Can't get the OEM and don't believe the OEM is fixable.