Technical What year spindles do these look like

These are spindles from a 50's Ford F100. I was wonder if anyone could verify what years?
Thanks
Mike

Sent from my LM-V405 using The H.A.M.B. mobile app

 

48 -52 ford pickup.

 

Do you know how much difference the 53's are?

 

Those spindles are F 1. 48-52. .812 " king pin. 9 degree K P inclination. 53-56 F100 has the bolt on steering arm on both right and left spindle. .859 " king pin. 5 degree K P inclination. I used the F 100 on my supermodifieds. Mid 60's to early 70's. I liked the stronger king pins and the stronger steering arms.