There are two pieces, don't know if you need both:
This is the same charger as the Motorola XTN and CP100 radios. Your local Motorola dealer may be able to assist you, if you were to mention these models.
And seeing you are needing a charger, you might also check your rechargeable batteries age. The life expectancy of this style battery is 18-24 months. On the battery label you will find a 4 digit date code. The first two numbers are the year, the next two are the week of the year. Ex: 1107 would be 2011 the 7th week.
And as you are likely aware, this radio will also accommodate 4 AA batteries. (The AA batteries cannot be charged using the charger, only the Motorola rechargeable NiMH batteries are compatible with the charger.)
Here is a link to the user guide http://www.giantintl.com/ContentManage/manuals/Moto/T71xx.pdf