The final piece is controlling the new heated bed. The SSR is a standard 40A unit, which is not needed but the larger SSR and larger heatsink will keep the system cooler overall as it dissipates heat over more area. It's really simple, one outlet, one inlet, one fuse, a 1/8" connector for control voltage and a 3d printed case(the reason the SSR heatsink is so large to not overheat the printed case and get it melty)