Brett,
I designed the chassis to use bespoke steering column parts. I used pultruded S-glass/carbon 1 inch shafts with bonded spline inserts and Borgeson joints.
Goodwinds is a good source for the pultruded parts. (Quite pricey of course.)
The upper and lower mounts were also bespoke alloy units w/spherical bearings made to fit the drivers angle and altitude preferences.
However, some folks wished a standard type column with turn signals, tilt and horn. The parts sheet that you were looking at is quite old and those numbers were from Speedway Motors years ago.
The current Speedway part #'s are:
Ididit 11-twenty-zed-thirty two-0020 Column (The written numbers are there due to the forum software not liking the number sequence **** for some unknown reason.)
Ididit 2401500040 Steering Column Ball Swivel Lower Mount, 2 Inch (footbox)
Ididit 2302470040 2.5 In. Steering Tilt Column Drop Mount, 2 Inch (upper)
Look at this page as there are many options for the drop mount that will allow you to put the column at the altitude you wish.
Hope this helps.