Not been able to find any info as to if this came in anything other than a SS (short cage) version, others may know; but if it is a short cage only, you are limited to the 28 max you already have (was this the original or was it a closer ratio?).

For the VIA, this means taken from Wikipedia - "VIA" ("Vehicle Inspection Authority") is stamped on all Shimano parts. It is an official approval stamp used to certify parts of Japanese vehicles – including bicycles. This mark signifies compliance with certain quality standards and is similar to the "UL" (Underwriters Laboratories) mark.