questions on 550 ltd

maybe a 550 ltd owner can help.is there any major differences from model years 80-83? im in the process of replacing/putting together parts for a 81 (told by the buyer) ltd. the date on the head stock says 11/81 but the ser# is a C a small 1 than a large 2. so it is a 80,81, or 82? (i know all the info would be on a title, but that would be too easy and titles are easy to get.) just want to make sure i get the right interchangable parts. it has a single front disc and 16" rear wheel. is there any other differnce between other years. thanks in advance for any help, gratefully yours, tp

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Probably the main difference is that the 1980 models used a single-phase stator, reg/rec, and flywheel. Later used 3-phase.