I wonder why you can't get those parts? Did you try sourcing a local transmission shop? I need to open mine back up and get those o-rings out. I think they are causing the piston to stick. I also think I may have put the larger piston with the o-rings in wrong. Are the springs all supposed to be pressing against the metal plate? In your picture it looks like the springs are the first thing you see when you take the plate off. Even in the diagram I have with the accumulator circled in red, but when I removed mine, the accumulator was the first thing I saw. It even has the print of the accumulator against the plate. Is it possible for you to line up the pieces from your valve body and share a photo please? I suspect that mine maybe was tampered with before and I have never known. THANKS.

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1990 190E 3.0L