Took a ride to the local Kia dealer today. I found that they have the exact
same part number filters - 26320 3C100 - in a Kia box. $6.50 each with all
the O-rings and they gave me the crush washer. I was going to buy several,
but he only had two. I bought one, and told him I'd be back for more when
his stock gets replenished.