Solar motorised pumps replacing India Mark II and Mark III hand pumps in Nigeria - Need supplier details

Rural Water and Sanitation Agency of Cross River State in Nigeria intends to convert the hand pump boreholes into Solar motorised system. Most of them are India Mark II and Mark III handpumps. What should be the minimum water column height and cost for converting them into Solar Motorised boreholes. Who are the exporters in India dealing with supply of quality materials?