Which one? You've got the bigger stud that takes the juice from the battery. And you've got the small wire that does i don't remember. lol.
I'd be going to like ace hardware or any hardware store and get a ton of nuts. 3/16" and under. I think the little stud is about a #10 machine screw. I'm pretty sure my starter had one big stud, two little studs and only one little stud was being used....there was a spare nut on the 'extra' stud. Might try that out. The big stud I think is about a 10mm stud or 3/8". Could be a little smaller like 8mm or 5/16".
'01 XLT disguised as a '03 Fx4 Level II
Big. Loud. Slow. Bright.