Need Help -I.D. floor shifter?

Can anyone tell me what this floor shifter fits? It's been in my garage for over 20 years and I'm trying to help out a guy needing a floorshifter for a 50's Ford . One of my sons had a very rusty junk 66 Mustang back about then, and I'm thinkin' it was for that .He had picked it up at a swap meet .Thanks for any info ! danzee


O.k. I found numbers on the shifter handle -45715- this could be the numbers just for the handle . I can't find any numbers on the main mechanism .

 

It looks like a factory three speed shifter from a late '60s/early '70s mopar to me.