I'm going to change my Escort hubs made of lead for a set of ally ones...question is ....the castlated nut on the end of the upright, is it a standard nut or a special tool ??? Looks odd

Its a std sized nut, cant remember the size off the top of my head, but its somewhere around 22mm i think.

You'll need to make some drifts to knock the new bearings into the hubs if you want to do them properly.

David