I replaced my 898 merc rams with XD rams including the pump and lines. It does not use the old reverse lock out. I dont have all the part numbers, just that i took them off a Bravo one drive from a 27' boat. Easy way would be to find clean used, fairly certain all new would be over $1000.00. As for hesitation, I'd look first at the accel pump discharge at the carb. Could be pump, setting, or discharge jet clogged. It should be a strong pulse of fuel. Next would be timing, and advance. A good timing light will show the setting and advance curve. Less likely, but i have seen it, is the fuel well itself, is height correct and no fuel dumping from bad top gasket or fuel vent?