Based on this product's specifications, here are some alternatives and similar models
Terminal connector Simet STB 50-3X Al/Cu threaded busbar connector (MPN 81004020)
Summary description:
Simet STB 50-3X is a threaded Al/Cu busbar (rail) connector designed for joining aluminium and copper conductors. Supplied under MPN 81004020, it provides a reliable mechanical and electrical connection for power distribution applications, repairs and installations where dissimilar metal conductors must be joined safely.