This is what I think of when you say "acorn nut"...

https://www.mcmaster.com/acorn-nuts/

Are you sure your existing lug studs aren't 3/4-16 thread for the Budd stud piloted wheels?

This is what Budd wheel lug nuts look like...

https://www.amazon.com/Outer-Standard-Hand-Thrd-37888/dp/B0040CTY92

Mike B smile


Mike Boteler

1956 Chevy 3100 Resto Rod
1952 Willys M38 Army Jeep
1983 Jeep CJ7 Laredo
1984 Jeep CJ7
+++++
Silver Spring, MD