Thanks for all the information on the air filter for my 3126 Cat Engine. I was able to purchase one from Freightliner parts department in Carson, California for $103.00 plus tax. The new part number is Farr - 99842-9. It has to be shipped down from Reno. I will get it in about a week.
Thanks to everyone for the help.
Lloyd Hall
PS. I have been Motorhoming for almost 50 years (a Cortez, GMC, And 16 years with my Patriot that I bought new in Bend, Oregon in Dec. 1996, and this is the best group and Forum that I have had the privilege of being a member. Thanks again.