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Welcome to the forum. You may be able to find something online, otherwise, the spindle itself has to be measured for the two bearing sizes and the length/depth of the two bearings on the spindle and then get ahold of one of the conversion companies and see if they can match something up. I am not sure as to the spindle sizes for a '57, you may be able to determine whether it is swappable with something else by using the bearing numbers and seeing what else they fit. May turn out to be the same all the way up into the early '60s, which then makes it easier to do a disc conversion. Next option is to do a balljoint interchange, see if at that point other spindles could be used to then do a disc conversion.