I inherited a 2004, might be 2004.5 sprtsmn 500 ho. I want to change the fluids in the front and rear cases but cant find a frain for the rear or the filler cap for the front. Also how to change the trans / gearbox fluid. I just purchased the engine oil, angle drive fluid, AGL fluid and demand drive fluid. Not sure which fluid goes in which transfer case. Im new to the 4 stroke world and Polaris. Thanks for any input.