Wtd Shimano 600 rear and front mech 6400 preferred

I have NOS boxed 6400 front mech and headset,plus lightly used rear mech, chainset, seat post,probably 8 spd downtube shifters.
600rearmech.jpg

600frontmech2.jpg
 
How much for the rear mech, I need a band on front, what size is the seat post? I'm OK as far as chainset goes now and I have just purchased shifters.

Alison
 
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