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

Vil-Yes these will work with the Aprilaire 550 Humidifier.Thanks,RobertFiltersAmerica.com

Which side up for water filter in alpilare 550

I don't think there is an up or down. I just fitted the filter into my holder and put it into the humidifier. All of the sides looked the same.

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

Hi, I don't think you are looking at my listings, sold by "thenan440". Amazon automatically inserts a shipping fee of usually $5.49 for my products. Check out the lister offering free shipping. Amazon prevents me from offering free shipping unless I pay $39.99 a month for a store. Sorry and I hope this helps you. Thanks, thenan440

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

The type of furnace is of no significance, If Skuttle is the name of your brand humidifier then I'd say no. This is an Aprilaire brand item, It fit my Aprilaire brand humidifier. Hope this helps you..try a google search for your brand and model number humidifier or contact your installer who put it in.