Slightly narrower version of 26-390?

I bought two pairs of the 26-390 for my windows. After measuring them, I was so sure they'd be the right fit, but they're just barely too wide to fit into the gap (the 26-390 is held up to the gap in the photo). I was unable to get a photo of the current tilt latch as it shattered upon removal, but I included a photo of the left-hand latch still in place. Is there a slightly smaller version of the 26-390/391 that might work for me?

Thanks!