Might sound daft but have you tried it the other way round?
are you sure bulkheads in the exact same position and angle
Has it got one of them rubber rings in the middle like a disco?
changed mine yesterday-and the one i took off is 3.1/4 in --or 84mm if your a foriner---so you can check the one you got--mine is a 1990 --90--allen
total length of the uj that connects the steering collom to the steering box---allen