do I have any photos?... YES, of course, and not only!!...
let's start with some details.
GP shock absorbers (at least the ones that were on my 2nd series GP): on the arm, there's a script: F - 898 , while on the back of housing: P 1963 and a A in a triangle.
when shipped at the shop above, owner found that one was very bad. we made a comparation with other shocks that we considered as donors, mainly for the body, of course, while we could still use the arm.
look at pictures - 0 was my shock. We considered at that time to rebuild either 1 or 2 and install on it arm from my shock . (1 is front for 1939-40 Studebaker, 2 is front for 1937-41 Ford)
- my shock had three notches on its face (where shaft comes out), theirs have six (theirs were only similar to a drawing I sent from "gp parts and price list").
- 1 had different pattern on the bottom, 2 had same pattern as my shock (numbers were different).
- 1 had same body height, 2 was about 1/2 inch (12 mm) taller than my shock.
at the end, and after deeply looking after an usable one to replace the worst of my four, I followed suggestions of Lazar (the owner).
here the considerations that he made at that time, and that I think could be useful to you all! "...I wish you good luck finding more cores. As far as I know, only first few thousand Ford-made Jeeps had these shocks, the rest had telescopic (tubular) shocks. Also, this is the only case where I have seen face with three notches, all other (for other cars) Houdaille shocks had six. In any case, shocks you find can be with bad (bent, broken, etc.) arms, it is easy to replace arms when rebuilding and we can use arms from your two remaining shocks. But, make sure that shaft rotates and that movement is kind of smooth (no grinding like in your first shock). You can also remove filler plug and take a peek inside - if it all dust + rust, it is bad, it should have some traces of shock fluid..."
hope this helps!