42-48 pin size is : .813 and the pin length is 6". thats the "standard" pin used on most streetrod front axles. the only info i can give you on the 58 f100 axle is the pins are listed as different part #'s for : 48-52, 53-56, and 57-64 1/2 ton[f-1, f100]. hope this helps some.