Domestic wholesales of passenger vehicles grew 4.7 per cent in March at 2,92,030 units as compared to the same month last year, Society of Indian Automobile Manufacturers said on Thursday. In March last year, wholesales of passenger vehicles were at 2,79,525 units. Two-wheeler sales clocked 12,90,553 units in the domestic market last month, as compared to 11,98,825 units in the year-ago period, Society of Indian Automobile Manufacturers (SIAM) said.