Click on images to enlarge.
Includes Sight Glass Hose (Ford Part # D1ZA-19837-A), the sight glass (Part # SG3, D2AZ-19D695-BK or YF-342).
One of the major differences between the reproduction and the original sight glass hoses, is that the texture of the originals was much more defined. You can see and feel the ridges in the hose on the originals.
Below is a close up picture of repro and used side by side, and it is obvious that the repro is not nearly as textured as the originals were. In fact when you run your hand down the repros, you can hardly distinguish the ridges.
Another notable difference is that the end that attaches to the expansion valve is bent at a different angle.
I think the image below speaks for itself as to another difference. The sight glass itself looks nothing like the original.
If you just need a functional hose, the repro will work just fine. If, however, you would like it to look remotely like it is supposed to, we would recommend going with a good original hose.