Joined: Oct 2009
Location: Anchorage, Alaska
6 disc heads usually have 18C815 basic numbers, and single disc (19C107 basic). I know that was how it was up until 2012 at least. I think it is still the same basic numbers, even in 2014 and up. Hope this helps you out some.
07 Mustang V6, GT 19'' wheels, Bullitt suspension & brakes, Dynomax dual exh w/GT takeoffs, Eleanor style grille, Shelby rear spoiler, CS/GT bumpers, SHR insert, side & rear window louvers, CS/GT scoops, SYNC/Navi, Roush hood scoop, Leather power seats, IUP w/GT MyColor, hood shocks, 8.8 trac-loc w/3:73 gears, logo'd trunk mat, trunk lid storage organizer. Gen 5 tail lights, '12 lighted vanities & outside mirrors, '13 Boss Strg Whl.w/audio controls, Ambient lighting, puddle lamps