I don't know bout puttin the kenmore one on there, but, ifin ya wan't a stack, just get a 6 inch plenum fittin, a piece a 6 inch pipe, a rain cap an a damper, screws right down over the GOSM vent on the top. Looks sumtin like this:
An here's the basic parts laid out fer ya:
An while were at the modin thin, another good un ta do is the probe port, consists of eiter a 1/2 inch er 3/4 inch watertight fittin ya can get in the electrical department.
Looks sumtin like this when it's all done:
Hope yall get some idears.