FS01 (no air filter) is still available
For all 2.5 ton trucks with the LD-465/LDT-465 engine: M35A2, M275, M49, M109A2, etc. Complete set of 6 filters for engine oil, air intake, and fuel system. All filters are made in USA.
Fuel filters are rated 4 micron nominal, 15 micron absolute. Oil filters are 23 micron nominal, 45 micron absolute. Nominal=50%, Absolute=99%.
Air filter is rated 410 CFM. (correct CFM for the LD/LDT-465 series engine)