Nice find! after a bit of searching this one looks the bomb.
http://www.mishimoto.com/honda-civic...00-triple.html
"Overall Size: 18.5" x 14.6" x 2.50"
Core Size: 13.78" x 14.09"
Rows: 3
Inlet: 1.26"
Outlet: 1.26"
Core Thickness: 2"
Tank Wall Thickness: .08"
Fill Neck Inner Diameter : 1.22"
Fill Neck Thickness: .12"
Drain Plug Thread Size: (M16) .06"
Drain Plug Thread Length: .047""
That one should handle my engine with any luck lol.