1972 Chevy K10 steering column parts

[72 K10 Fanatic]

Hi there- brand new to this site and forum. I have a 72 Chevy K10 (highly modified) that came with a manual tranny, but I replaced with a Turbo 400 and Lokar floor shifter. The steering column is the original and I need parts for the upper column, including the bearing and fiber washer and other spacers around the turn signal switch. Anyone know a good source for these and , possibly, an exploded diagram for this exact steering column? Thanks- any help much appreciated