B 17 1 = February 17th 1951 - found on the transmission, right?
So, that had ID's only the transmission.

What parts do you mean by "chassis"?

"chassis" sometimes means the supporting frame of a vehicle
Do you have the old/original frame?
Is that what you are trying to ID?

"chassis" could also mean the equipment attached to the frame
- It looks like you/we have ID's the transmission.
- Presumably, you have ID'd the engine (or, please post the engine codes).
- Post the rear-end code, and you will have ID's the drive-train equipment.

What do you mean by "chassis"?