Try to use Liquid Wrench, PB Blaster or some other type of penetrating oil.
With vice grips you may be able to get a good enough grip on what's left of the bolt to remove it.
You can file down opposing edges of a bolt or nut so that there are 2 flat edges and then try vice grips again. This may be enough to give the vice grips enough of a bite.
If you have a propane torch you can apply heat to the bolt to help loosen it. Be careful using an open flame around an engine bay or any other location where there could be flammable material.
Use a hack saw, air cut off tool or a Dremel to cut a grove into the bolt head and then use a straight blade screw driver to remove it.
Storing small hardware is one of the more difficult things to organize in a garage. This article covers many different storage solutions depending on the amount of small hardware you have.
|Image||Price||Price Per Compartment||Max Compartments||Max Length|
|Storex Literature Organizer Combined with Storage Containers||$(Storex Price) + (Storage Container Price) * (24)||$(Price) / (Max Compartments)||(Storage Container Compartments) * (24)||13.625"|
|Stack-On 60-Bin Plastic Drawer Cabinet #DS-60||$23.67||$0.39||60||5.25"|
|Plano Molding 974 StowAway Organizer Rack||$30.29||$0.32||96|
|Akro-Mils 64 Drawer Plastic Parts Storage Hardware Cabinet #10164||$25.53||$0.4||64||5.25"|
|Akro-Mils 64 Drawer Plastic Parts Cabinet + 48 Stack-On Drawer Dividers||$32.52||$0.29||112||5.25"|