Brake Master Cylinder 512

Does anyone have an exploded view of the 512bb brake master cylinder, I am fitting new seals to mine and I can see that it has been opened before, and want to make sure that nothing has been left out, if you look at the last seal (nearest the booster) there is a very thin spring that is sitting directly on the seal, this is the area of concern!!!!

 

This is an image of the rear section that I am concerned about, I think I am worrying about nothing as this is the same layout as mine.
If your cylinder is good, but you want to fit new seals, although Eurospares do not offer seals for the 512, they do offer them for the 330 and they are the same!!!
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Thanks Paul, now I am looking for a seal kit for the clutch master cylinder, I will check with Superformance