Bill, I recently pulled the steering box out of my 41 to rebuild, only to find out the box is from a 37-40 (from the helpful people on this site). I measured the distance from the top of the bushing to the end of the mast and see it is 1-7/8". Don't know if that helps you.
In getting my 41 back on the road, I've found it is a collection of parts from other model years: 55-59 front and rear axles, etc. I love it, but keep that in mind with the measurement I just provided.
~ Victor
1941 3/4-Ton Pickup (in process). Read about it
in the DITY Gallery1955 Grumman Kurbside "Doughboy" 235/3 on tree w/ OD
1957 3100 - moved on
1959 C4500 Short Bus "Magic Bus" - moved on
1959 G3800 1 Ton Dually "Chief" - moved on
1958 C4400 Viking "Thor" ~
moved on to fellow Bolter 
