hi have got this top, Koolance Laing D5 Pump Top and Reservoir Base Rev 2.0 : COV-RP450 and i have the aquacomputer D5 with aquabus and the problem is the clamp ring, i cannot use use the supplied one with this pump, do AC make one which will work? i presume they have one with there aqualiss top/res. Can these be bought?