I have been getting Alliance ABP/N122-32FRT01 filters from the nearest Freightliner dealer (80 miles). He ships them to me and I get 3 at a time. I called him yesterday and he says they are out of stock and Freightliner is temporarily out of stock !! The only replacement that I know of is a Racor S3201P and that is about as hard for me to find as the Alliance filter. Can someone tell me a number for a generally available filter such as Wix, Fram, NAPA, etc. The Alliance filter is a 30 micron primary filter on my dual filter system. Cat 3126B, 2000 Holiday Rambler Endeavor. The 2 micron secondary filter is a Cat filter that has always been easy to find.