retrofit

retrofit
    n 1: a component or accessory added to something after it has
         been manufactured
    2: the act of adding a component or accessory to something that
       did not have it when it was manufactured; "the court ordered
       a retrofit on all automobiles"
    v 1: provide with parts, devices, or equipment not available or
         in use at the time of the original manufacture; "They car
         companies retrofitted all the old models with new
         carburetors"
    2: fit in or on an existing structure, such as an older house;
       "The mansion was retrofitted with modern plumbing"
    3: substitute new or modernized parts or equipment for older
       ones; "The laboratory retrofitted to meet the safety codes"