Train Hooks from the 1960's x507, x508 and their plates.

[Gerald Lasser]

I started doing the hooks and plates for the early train connections and now it is time to start uploading them and here comes the trouble:

What is currently on the PT?

Hooks: x507 and x508
Plates: 737 and 509 for the hooks, 753 for magnets

x507
This is actually a part that consists of two parts, the bottom plate and the hook-element
Furthermore there are two versions of it, the earlier one where the hook is connected in the middle with a small round element and the latter part which has a rectangular interconnection with the botom plate.

For compatibility I would propose:
- add the two versions x507a and x507b
- make x507 a "move to" to x507a

so far so good, what number to assign to the bottom plate?

x508
This part is one mold, I  can simply use the existing file on the PT and amend it.