Aprilaire10 A2 10 Replacement Water Panel for Whole House Humidifier Models 110, 220, 500, 500A, 500M, 550, 550A, 558 (Pack of 2) Aluminum

I have Aprilair model 550. Does it come in quantity of 2 for $17.20?

Which side up for water filter in alpilare 550

this says eligible for free shipping. But when I go to check out with a total order over $100.00 it wants to charge me $7.17 shipping for this item

I need Skuttle model 2001 # A04-1725-051 water panel filter for humidifier on my York furnace? Is this the item I need?