That's what I meant by 'maybe others' in my earlier thread. The 757 is a model I'd never heard of. I believe the 22LR was once the 252, but can't swear to that.
Grip shape did change, but can't say when. My 353 is a premier, and my 454 is field grade. I wanted to see what the 454 looked like dressed up, and tried putting the 353 grips on it. Don't recall what the difference was, but they didn't come close to fitting.
I'll bet some lucky stiff out there has one each of all these X5X models.
Tuckerdog1