Cat. Diamond uses the "H" series of Meyer packs. The "H" series can also be used on Meyer plows. These packs have a longer lift stroke. Seeing how the E57 looks like an E47 which was available as both a regular and "H" models, I would assume you will see the same available. I would guess that Meyer has made the change to the 4 inch motor ,like the E60, to increase speed and reduce amperage draw that the E47 had. Not sure how the pack measures up to the E60 "quick lift" that is common on larger Meyer and Diamond plows.