Fast Ratio steering Pitman and Idler arms

2 sizes of pitman arm as well. although ive never tried it i'd guess the big spline pitman might fit on a small spline manual box and end up at a different height...
or it might just rattle about...this is a guess....
would the small one JUST fit on the end of the big spline box....? dunno.

my only experience is buying a NOS sector shaft that was mislabelled and didn't physically fit my steering box... cost of return.. prohibitive...more junk for the collection.

either way if it kinda worked the pitman arm would be in the wrong place and the centre link would no longer be parralel with the floor

16th of an inch difference in the size...

big spline boxes are usually power boxes, c body boxes etc but i think they may have confused things on the b or e or in the mid - late 70s .....its not may area really.

but you do need the correct pitman arm....

Other option... do you have the idler the correct way up/down and the centre link around the right way..... an idiot may have visited your car a long time in the past and left a trace ....
you would expect it to hit sump or headers but some accounting for the wrong link applied incorrectly may be necessary v8 and six differered i belive...

Dave