... Gasket (all models)3RK15377-01Body, 3/4”-16 UNF fuel ports (FG, effective 1/15/96) RK15377-02Body, 16M x 1 ... .5 fuel ports (metric, effective 1/15/96) RK15377-03Body, 3/8”- ... 18 NPTF fuel ports (effective 1/15/96) RK15082Body, 9/16”-18 UNF fuel ... use RK15081-01, after 2/96 use RK15081. (The fuel ports have a 1 1/4” square boss on models made ...