This is a used drive cog and housing for the DC24. 

Please note: there are two types of cog; the one pictured is the later one (with a longer central spindle) that is more popular. This one will be compatible with all new brushrolls supplied, as nobody supplies the old-type brushroll any more. 

If yours has a shorter spindle and you find this doesn't fit your brushroll, simply swap the drive cog over from your old one. It is usually a T8 Torx screw to do that. 

This includes the drive belt 13929-01-01 and spring. If you need the full brushroll motor, we sell those >>here<< and they come with this part already. However, if you only need this part, they are unavailable new, but are available here used.