Can't remember if those were the round ones (memory loss from era of 2007 3400RL), here are several that I found:
Phone and tv connectors
For some reason, I was thinking that they were round, which is shown a little ways down the page.
Bingo
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Bingo and Cathy - Our adventures begin in the hills of WV. We are
blessed by our 2014 3850FL Big Sky (previous 2011 3750FL and 2007 3400RL) that we pull with a 2007 Chevy Silverado Classic DRW CC dually.