Hi yes there right i had loads of probs useing the wrong pump and reg on a ZVH with twin 40s. I bought a red top pump and yes a filter king pressure reg with the filter in and all probs sorted. I had mine set quite low then as I had it on 2 psi. Try getting them from Fuel system Enterprises (http://www.glencoeltd.co.uk/) Tell them your trade and get delivered to a local garage and it will be a lot cheaper.