the standard AMK under hood bolt kit contain all a s-39 ( silver cad) finish- 1970 osborn body assembly manual ( orange) - page 19 item "A" bolt #57039-s2 , item "B" #57039-s2, item "C" #57039-s2 all bolts that fasten latch and support to radiator support-top and btm. also page 23 item "E" # 57041-s2 - mounts upper radiator bracket to rad support ( big radiator) page 34 same bolt #57041-s2 secures dash to cowl at different locations B, D, F , H - & L - 57039 s-2- all bolts denote s2 finish- so why the difference in bolt finish yet same part numbers ?- for a metuchen dec/69 boss