Steering box identification help

[Hyper_pak]

I have a box here that I don't know application.
I know it's not fast ratio.
I seem to remember the mounting bolt size changed at some point.
Casting number seems to be 2537345

Any ideas on fitment?
And can you buy just the rubber boot on the steering arm?

 

[cudamark]

Looks like the '67-72 A,B,E box.

 

[cudamark]

Mounting bolt diameter changed to a larger size in 1967. It will still interchange with the earlier box by adding a sleeve to the bolt. You can also use the earlier box on the later cars by drilling the hole larger. Keep in mind that some of the earlier boxes were made with bushings instead of bearings, with the bearing type heavier duty and thus more desirable.