Thanks, Cathy. Trimming we can do. I was worried that trimming might make the opening too wide. I hadn't measured it, yet, as I was holding the 301 over the opening in my left, holding down the right side spacer mechanism for snaller machines with my right, and trying to explain/ask DH what he thought. He did suggest I buy a different machine for that cabinet, however I detected a bit of sarcasm in that comment!
And if I did, with my luck, I'd still end up with a pair that doesn't work together!