Right. I've also become a student of Volvo-ology. The 610 is a 61" long "midroof", while the 660 is a 66" long "condo", and the 770 is a 77" long "condo". And you're right, those other numbers are newer versions of the above units, and were released as 2003 models, even though the older series also go through 2003 year models. Go figure! Hope this helps you. Take care.
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