Electric water pump diy

Hi anybody used a for ex chevy sb electric water pump and made a new backing plate been looking at this before and now im gona see it true a el pump for a mopar sb is like 500 dollar here in Sweden but i can bye one for a sb chevy or ford for 170 dollar big diference just wundering if some body here tried this im gona contact the suplier and have them messure the cc on in and out on the pump