I don't wish to question authority, as it were,
but the
internal cables are 104 pin (If I'm counting them correctly)
and the external SCSI port on the back is 72-pin mini-D. That
*looks* like wide SCSI to me! If it's not, then what kind of
cabling is it? The ordinary narrow-SCSI stuff I knew from
back in the '80s and '90s was 50-way ribbon cables with
50-pin IDC connectors internally and either 50-pin Centronics or D25
connectors externally.
The VS3100s all take 50-pin SCSI-1 disks. The internal cabling depends
on the exact model but all three styles of VS3100 use 50-pin disks.
You can get 68-pin SCSI-2 disks to work with an adapter (usually).
Antonio