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retro has a "has been" connotation as it also means
"things from the past" in a way suggesting not "from yesterday" but more like "many moons before yesterdays!"
ret·ro·fit/;retrô & ;fit/
Verb: Add (a component or accessory) to something that did not have it when manufactured.
Noun: An act of adding a component or accessory to something that did not have it when manufactured.
Adjective: Imitative of a style, fashion, or design from the recent past: "retro 60s fashions".
Noun: Clothes or music whose style or design is imitative of those of the recent past.
ScottM and rocker - how about "retrofiX" - it's probably even brandable - catching the retrofit sense and the fixing stuff sense.
You're figuring out what the part is-- and then building one from scratch.