Front cab mounts are specific for 61 to 64 F100 and F250s and 65 F100 4x4s 65 66 F250 4x4s and all 61 to 66 F350s. They look nothing like a 65 66 mount for 2 wheel drives and the 66 F100 four wheel drive and will not fit the eariler cabs. The 61 floor is a raised floor with instep where as the 65 up floor is a dropped floor with no step.
This includes body 66 unis and body 81 conventional.
The floor mounts are reproduced by Rick at Carolina Classics along with a correct stamp drivers and passenger front floor pan.
Garbz