borgeson steering box identification?

[Zachalanche]

I found a power steering box locally being advertiesed as a mustang steering box. it does look like the same bolt pattern as a mustang steering box, but i noticed It only takes 3 turns lock to lock. is it possible that this steering box is for the C3 vette? and even if it is, is it compatable with the mustang? a 3 turn steering box would be sweet.