I have seven D7 rollers that came with a junk D7 3T some years ago.  All will turn on their bearings, most not easily.  I was told that they fit the early 3T but never checked; I don't know what else they fit.  They range in condition from nearly new, still in yellow paint down to probably usable.  There are both double flanged and inside flanged.  

They are located at Hood River, Oregon.  Make offer via personal message, or request further info via this site.  Crating and shipping must be considered.  Thanks,

Jack