Serial number doesn't bother me so much. A long top-tube is a bit harder to deal with for fit issues. Trying to slide the saddle forward can help a tad, but might not be ideal. Not that I would 'really' suggest such, as it feels funky, but you could try the stem 'reversed', more tillerish.... But, if there's a reason to let a Riv go, a long tope tube would be one.
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