Not sure what application this filter used for, but the previous ST9688 (7317 size) used a metal dome end bypass and was slightly longer than the 6607. In my observation, there's few applications where the 7317 application won't fit/work in place of the 6607.
Overall I preferred the Wix made ST line to the current line. Most of the new Champ made ST line are ecores with combo valves. At least the Wix made line had popular applications like the aforementioned 9688/7317 and 3614 used classic design, no combo valve.
Current Champ ST line has no 7317 application, and the 3614 is an ecore with combo valve. My.02