I should be able to get those numbers without too much hassle.
I'd still recommend talking to Phil about the numbers, hopefully he is aware of the o-ring situation. I hear is is very knowledgeable and helpful, never talked to him myself, being a dealer guy and all.
I would venture to guess the "fuel screen" is the prefilter, not sure though, as there is a screen in the tank as well.
If he ID's the part you need and he says the o-ring is included, just ask him to confirm this before shipment, as I highly doubt this is the case.