Hi JC:
There were two different models of water pump for the 119.97x models. According to the Pee-Pee system, the breakpoint was engine 10204/10205 in the M119.974 (E500), so for the E500E this would have been a very late cutoff in the production run. Thus, most E500Es would run the early style pump.
I have a spare pump, a Graf PA578, as pictured. This is a spare for my E500, as a replacement for factory pump 119 200 15 01 (which is superseded from 119 200 09 01). This is the correct pump for my car, which has engine number 8486.
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As pictured, my PA578 **did** come with o-rings and a water pump gasket. However, as you can also see from the photos, I ordered (separately) a factory gasket, made by one of my favorite OEMs, Elring) and will use that when I need it, not the "included" gasket, which I don't think is as good of quality as the factory Elring gasket. But yes, the PA578 did come with gasket and o-rings.
Your pump, the Graf PA613, is also spec'd for V-8 models, but it is a different SKU than the one I have. The PA613 is the replacement for the "later" version of the M119, which would be found on very late E500s, as well as the SL500s and S500s/420s probably from the 1995 models onward (would have to check the engine number vs. the Pee-Pee notation). From what I can see online, and given my experience with the similar PA578, I think it is very safe to assume that the gasket and o-rings would come in the box. However, for prudence, I'd still order the factory gasket.
Also, I happen to have a Graf PA610 water pump in my parts stock. This is the pump for the later M104 models (and for my 1995 G-wagen). This pump DOES NOT have any gasket in the box, though it DOES have two packets of o-rings, as pictured.
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Cheers,
Gerry