"retrofitted" in the verb sense
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"
fit in or on an existing structure, such as an older house
"The mansion was retrofitted with modern plumbing"
substitute new or modernized parts or equipment for older ones
"The laboratory retrofitted to meet the safety codes"
Source: WordNet® (An amazing lexical database of English)
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