The part number for the caps is
60PBC-CC ( CC is the Charcoal colour code )

Please go to the following links below and check under the Documentation Tab for more information.
Australia -Â https://www.clipsal.com/products/detail?CatNo=60PBC&itemno=60PBC-CC&backto=/search?q&tab-document-1=0
New Zealand - https://www.pdl.co.nz/products/detail?CatNo=60PBC&itemno=60PBC-CC&backto=/search?q