The Leatherman Charge Ti, Charge XTi, New Wave, and Surge all have the same receptacle, designed for a removeable lanyard ring or belt clip accessory. (The rocker lever that holds the lanyard ring or belt clip in place, also doubles as the blade lock for the inner tools.)
All I'm doing is substituting a modified Sawzall blade. It (of course) fits equally well into all four Leatherman models. BUT, do to the different wider construction of the handles, the Surge does not hold the saw blade securely during use.
The Charge Ti, XTi, and New Wave work fine.