How to connect 4.2mm speaker connectors to a receiver

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Hi, I was looking to get a new receiver with more features, but unfortunately my speaker connectors have a 4.2mm connector on the end of each speaker wire. I can't seem to find any receivers that have 4.2mm speaker ports, but I really don't want to buy new speakers in addition to a receiver. I have included pics of the speaker connectors and what the ports they plug into look like. I'm curious if anyone knows of any receivers with 4.2mm ports, or if there's a way to convert 4.2mm jacks into a standard speaker connector.

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