I'll cut them as close to that 1.25" as I can. In that pic it looks like there may be that much, they bend just above the finned part of the core. So that means we should have all 5/8" Cu tubing already attached to the tanks, provided I'm right about that 3/4" only being at the end where I can get rid of it.
I just checked the pic again and it sure looks like I'll be able to get rid of the 3/4" part to me. Gotta like it.