[HO455]

I'm by no means an expert but I will try to help.
1. I believe that it is called "intermediate" as it is on the center part of the steering shaft with the shaft from the steering box being the lower and the shaft from the wheel down through the firewall being the upper. Prior to sometime around the mid fifties the steering box and the columns were all one piece, then for safety they were cut into pieces so the steering column wouldn't get shoved through the drivers body in a head on wreck. The lower flange is on the steering box shaft.
2. Those don't have to be removed as the column comes up through the dash and out into the cab when removing.
3. I pretty sure that is the "pot joint". It is a break away coupling between the intermediate shaft and the upper shaft. It in conjunction with the rag joint prevent impalements.
4. Adjusting clamp. If you remove one of the bolts you should be able to see it passes through an angled slot in the column's housing so when rotated the bushing can be adjusted.
5. The clamp for the firewall to column seal.
6. I don't know the proper name of it but it holds the firewall seal on the firewall and when removed makes the hole large enough for the column to pass through.
7. " plate thingy ". I'm sorry. I have no idea on that one.