Thank you. I love exploded diagrams like that. I just wish that there were some vintage parts houses where you could still order those small parts. Maybe Euro Asia imports would have them. My LBS mechanic used to be able to order certain NOS Shimano parts through them. I thought I heard that Euro Asia might have gone out of business, does anyone know?

I ended up checking the other used M900 cantilever caliper and it has the springs and the plastic covers. So really I am only short of one set of springs and covers for just one caliper.