You can drill/counterbore most 4 jaw chucks and some 3 jaws to fit your tee slots.Or you can stick weld it on . NOT reccomended although I really have seen this method utilised in a mechanics shop, Never took MY car to him.The 6" chuck I have has a plain back, but also has 4 holes for mounting. I used 4 socket head screws to homemade T nuts in the slots. No riser or backing plate required http://www.accusizetools.com/4-jaw-independent-lathe-chucks-plain-back/