Help with o-ring identification

[MoparMap]

So I'm almost done putting my engine back together after the spun bearing, but I'm left scratching my head at one o-ring I can't figure out. I got a lower end gasket set from Roe Racing and the description says it includes:

Thermostat Gasket, Rear Main Seal, Rear Main Gasket, Timing Cover Gasket, Front Crank Seal, Oil Pan Gasket & Water Pump Gasket.

I look at the picture and all of those are there, but there is one more o-ring in the kit that isn't identified.

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All of those are in the picture above, but the one thin o-ring just under the front crank seal in that picture I cannot figure out. Normally I would think it was just an extra one because it's a Dodge part number and maybe it goes to the Ram SRT-10, but I have a matching on in my pile of parts that I took out. Unless I just happened to have a loose o-ring in my garage, I cannot for the life of me figure out where it might go. It's way too big for a oil pump pickup tube o-ring. The only other thing I could think of would maybe be the oil fill cap, but that seems like an odd part to include in a lower gasket set. Any ideas?

 

[steve e]

I did a little research and I don't think its for the viper, maybe its for the Ram SRT pick up tube, looked at everything for a viper lower set and there is no place I can find where it would go.

 

[MoparMap]

I asked Roe as well and they said oil pickup tube. I told them it was way too big for that on my car at least, but they haven't come back with any other ideas. I think I really might have just had a loose o-ring running around in the garage I was comparing it against. I really can't find any place for it otherwise as it's probably about 1.25" diameter. I may try it on the filler cap though. Those have a tendency to plasticize with all the heat cycles. Have already replaced it once before.