This product is specifically designed for this unit:https://s.click.aliexpress.com/e/_c3S2rWZ3

This programmable resistor board from the 1970s features a modular design, consisting of two interlocking parts that can be firmly snapped into place during installation without the need for glue. Its optimized geometric structure facilitates clean 3D printing without the need for support structures, significantly reducing post-processing and assembly time.