I assume you know the trunion has to come apart and off not just slip over the whole end. Looks real close to original ones size. Save those clamps if you can.
Actually I think you thread the new boot through the housing without disassembly. The instructions with the boot say to do it this way although I haven't actually attempted it yet. I would avoid removing the housing if there's any way possible as it's near impossible to set the cross pin precisely and I haven't found anyone to fix the one I disassembled 25 years ago. No one around here will even try to balance the unit.
