You might be thinking of a specific area or feature, such as:
* The glove box: This is the most likely candidate for what you mean by "convenience center."
* The center console (if equipped): Some C1500s had center consoles with storage.
* A specific aftermarket addition: Someone might have added a custom storage unit and referred to it as a "convenience center."
To get a better answer, please describe what you're looking for in terms of its function (storage, power outlets, etc.) or its location within the truck's cabin.