Bought it only as the cheaper ewp 80 has mounting holes already in the case and this more expensive ewp150 does not. Therefore I bought this. It works but its fiddly and slips over the pump very easily when first fitting. Manual for the pump says the pump can be supported by the hoses around it and does not need this ring, yet I think its too heavy on its own without the bracket in my installation with engine movement from a V8.
Ill see how it goes when the car is used this summer. It is well made but very expensive for what it is in the UK. If it were me, I would make your own mountings.