I did exactly that (installed the 1931 upper steering column support, and removed the lower steering column clamp of the original gas tank support), just for peace-of-mind; the longest part of the process was prepping and painting the new support - it comes as bare metal.
I ended up reusing the old original lower steering column clamp - it fit the new upper steering column support perfectly, and looked nicer (was already black (which is what I painted the new support), vs. the new ones being sold at the time which were bright and shiny - I assume stainless).