i looked at my parts book on the w-4. for the wishbone , there is a serial number break 501-1758 pn 53151dx and for sn 1759 and up...pn 60788dx. looks like the early ones used a 1-1/8 nf thread, the later used 1-3/8 inch nf thread. axle pivots are also different ser 501-1758 used 50190d and ser 1759 and up used 59815d. appears the later tractors had a heavier front axle. a lot of the parts on it dont interchange, but if you are switching out the whole unit, i think it should work. check the thread size and diameter on the wishbones. if they are the same you should be ok.
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