I rebuilt a 8274 that I got cheap last year and also decided to upgrade the contactor. I found the Albright to be hard to find at the time due to overseas shipping so I bought a Temco one, turned out to be rated for slightly higher duty and a lot cheaper to my door. It seems to be less than $50 on amazon now
Zon link
As far as the old switch not working just take it apart, its super simple, and probably a loose connection or broken wire. And if it is the switch its a pretty generic three position switch that shouldn't be hard to find for a couple bucks.