It depends on the condition of the lugs and the buss stabs on the panel. The breakers it's not a bad idea considering the spring clip for the buss connection can get weak with heat cycles so if the are easy to plug on then replace.
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Guys Eaton has a retrofit interior that will bolt into that box and still be ul. Eaton makes most of the 1 inch breakers and even has a CL line of classified breakers that fit everyone's panel for the most part. If you look at the residential and light commercial catalog in the last part of...