Hello I have a 90 bronco with a efi 351w and im missing one nut for the manifold to exhaust pipe flange. I have looked all over the net and can't find the size I know its a 1/2in socket but I need the thread pitch and size, had the parts guy try to sell me the stud and nut kit seem really expensive (almost $20) for just a nut and to install the full kit I have to pull skid plates and the trany supports just to start to get room to do the job, seems like a lot of work to replace 1 nut, any help would be much appreciated, thanks

 

Found it! For any who needs to know for a large range of 90s fords the exhaust collector flange stud is a m12 1.75, Dorman 430-312 or 432-312 are are the replacement nut mattering on application.