There seems to be three sizes of universal cooler available from various suppliers.
The one used by Turboboy that works and fits well
CORE size 550 x 140 x 65
Overall width 690
Inlet & outlet 57mm ( 2.25")
The one used by FletchyFR that works and fits well
CORE size 550 x 175 x 65
Overall width 690
Inlet & outlet 57mm ( 2.25")
The as yet untested one
CORE size 550 x 220 x 65
Overall width 695
Inlet & Outlet 57mm ( 2.25")
There also seems to be two distinct qualities of product - the good one rated at 45psi and the
lower quality ones rated for only 30psi.
I would suggest you select one rated for 45psi.