The vent windows were the same size on 55-6 junior and senior sedans. According to parts manual, there were two handle assys so that difference might be noticeable. No idea when in 55 production the changeover was made. You might be able to get an idea of which you need by the description of change
You might also get in touch with Mike Dulinski. He has a large assortment of used 55-6 parts & might also have what you need.
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