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The 722.5, I think was Mercedes mistake on their fleet of cars. The aftermarket vendors for parts is very low(only a several) here in the USA, yet the 722.6 many many aftermarket vendors exist, and with these aftermarket vendors improve parts.
Here is a pictorial parts list to help in parts ID. The company who makes this list is the only one I've found as the one I bought my rebuild kit no longer carries parts, probably because of the low parts request.
Martin
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