I think if you spell "restoration" backwards it spells "2 steps forward and 1 step back". Be happy it's only 1. I've been fighting getting the correct replacement spring sets for the '66 Chevelle backrests on the buckets for 4 weeks now. Finally got some that are close enough to work without major remodeling. Kind of like an Impala seat isn't the same as a Biscayne....wth ???
Then I ordered Medium Saddle carpet to go with the 2 tone Fawn interior. Who knew it was Gold ?? Sent that back too...waiting on medium brown now.
Yep, steering columns are a mystery all on their own, and the "special" washer was a floor shift only thing on my '66 Chevelle too and it had a "special" rubber spacer to go with it to prevent the column shift cup from rotating. Try to find one of those...
Everything you have done on that car is concours level and looks that way. I know it's frustrating, but be proud of what you have accomplished.