Retrofit rhymes with:
counterfeit, misfit, outfit, proudfit, armpit, beckwitt, bullshit, cockpit, counterfeit, drillbit, goldschmidt, hammerschmidt, horgavitt, hypocrite, identikit, kleinschmidt, kuhlenschmidt, mandalit, messerschmidt, messerschmitt, misfit, moonlit, outfit, outwit, proudfit, sunlit, tanartkit, telit, tidbit, waffenschmidt, waldschmidt, wolfenschmidt
Retrofit sounds like:
redraft, redrafted, retrieved, retrofitted