1948 8 n hyd.pump saftey/relief valve

I am sure this has been covered before but I have not found it so I am asking for some help.does any one know what the proper thread pitch for the 8n hyd. Saftey valve is because the after market one don't fit. 1948 ford 8n tractor the one that is in it,is original to the tractor at leat it's a original oem style with cotter pin

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