Replacement air filter for all years Subaru Robin engines EX13 EX27 SP170 SP210 using part number 277-63603-08. Filter measures 3 1/4" x ~4 7/8" x 1/2" (82mm x 125mm x 15mm) Filter is shipped un-oiled; add 1-2 cap fulls of oil to the filter and squeeze/work it for a minute in the supplied bag, then install.