The part number for a speaker cable mechanism is a
30BCBM for black and a
30BCRM for red.
30BCBM
https://www.clipsal.com/products/detail?CatNo=30BCBM&itemno=30BCBM-WE&backto=/search?q=30BC&tab-document-1=0
30BCRM
https://www.clipsal.com/products/detail?CatNo=30BCRM&itemno=30BCRM-WE&backto=/search?q=30BC&tab-document-1=0