I'm currious why you want a replacement 260M to replace your current one... Do you feel the current one is in bad shape, or needs significant repairs??
My 260M was in a house on a river that flooded regularly, the base was severely corroded, the motor has a 'high water mark' inside it, and the controls had water damage..
And mine was basicly ignored untill it was sold to me. You have seen the grate pan rollers... How long would it take to grind the rollers flat with a steel/steel contact ??? decades I'd guess.. With all the worn out items on this boiler, it must have sounded like a horror-movie sound track when running...
Just currious.... Greg