Case 580SE Removing Front Axle Nut

Hello Everyone, I am working on a case 580SE, It is in need of kingpin replacement. It is a early 4x4 model with the 4 bolt kingpins. Ive got stuff torn down but have ran into an issue with the spindle nut. Its a 6 slot type nut and none of the auto stores seem to have the correct size I need. Does anyone know what size the socket is to remove it or a PN of the tool as I don't see this coming off without that tool. Thanks!
 
The Case part # for the tool for the pinon is Cas-1598A, I made a peg spanner out of a piece of pipe bout 6" long of the right diameter and some key making bar of the right size, cut the key bar into inch long sections one for each slot in the nut, use a hose clip to hold the sections in the right place on the pipe and weld them to it, either weld an old socket in the end of the pipe to turn it or put a hole through the pipe for a tommy bar instead.
AJ
 
So I finally got the kingpin done. Top one popped out with my homemade puller, bolt size is an M14x1.50 for the puller and the top one was in decent condition. The bearing in the bottom vaporized. The pin was stuck in there too, rusted...had to drill a big hole then use a thin sawzall blade to cut it out in pieces. was a pain but none the less got it done. I laughed because case wanted nearly 80 for 1 bearing and I was replacing 2. I know how cheap bearings are and I sourced the dimensions and was able to find the correct bearing for 20 a piece from NTN. specs were good at 10,000lb load capacity per bearing.
 

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