Looks like it might be an assembly of 4” LED truck/trailer/RV tail light modules, something like these:
https://www.amazon.com/PAIR-BRAND-RO...ed+tail+lights
If so, and you can get it apart, find the manufacturer and part # on the module, or find something close visually and ad-lib - lots of options on Amazon. Probably also on e-bay or other sites.