Looks like these are different, think the MCA-C5 along with other audio equipment uses 4 pole 5mm pitch phoenix connectors. Unfortunately, I can't seem to find any locally and online has a long lead time.
You can get them on eBay - they're the multicolored ones: (6) Russound Speaker Connectors - CAV6.6, CAM6.6, MCA-C5, MCA-C3, CAA66, CAS4 | eBayLooks like these are different, think the MCA-C5 along with other audio equipment uses 4 pole 5mm pitch phoenix connectors. Unfortunately, I can't seem to find any locally and online has a long lead time.