It doesn't use ID's anymore, it now uses idNames.
329 is now "minecraft=saddle"
13067 is now "SaintsPack=DubGun"
The same goes for ammo
266 is now "minecraft=gold_ingot"
The folder structure was wrong.
Instead of dishwasherpack you should use "saintspack" and in there "dishwasherpack"
(So that when you extract it in the mods folder, it puts everything in the right place)
and instead of assets you should use "SaintsPack-0.6-Minecraft_1.7.2" (Or the new version when needed)
And in there put the "assets" folder
Also rename "sound" to "sounds"
Do not use paint to recolor an item, use Gimp instead (Paint does not know how to do transparent)
Starting the game twice is needed for packs to work.
This should work (tested):
http://www.mediafire.com/download/2u2ux3dso1cvsvh/Dubstep_Dishwasher_Gun_Pack.zip