Car is a 67 Coronet RT

Has an antenna that is missing the top plate and nut. I assumed that it was the correct antenna as it has been sitting down inside the fender for years. I ordered a nut and top plate from Year One and the plate fits, but the threads on the nut are way too big. The antenna must be from another car, but I dont know what nut to buy for it. It takes a much smaller nut to thread it on.

I really don't want to spend the $150 on a new antenna so I was hoping to just buy the correct nut.

Anybody good at id'ing radio antennas? I know it is a long shot, but anything would help:)

here is a pic

doesnt look like an original antenna

Not stock, try Radio Shack?

I really dont want to throw $150 into an antenna so I was hoping to use this one or just a cheap aftermarket unit. The hole is 1 1/8" and every OTC unit I have seen is for a 1" hole.

Time to be creative....it isnt a show car, just a fun driver so I am ok if it is not factory....as long as it looks good on the car:)