White 543 corn planter rebuild

[Lakebilly]

I am trying to put in service a White 543 4 row corn planter. I need a parts manual & a parts supplier. The fert hoppers have been exposed to weather & I don't know if they are fixable. I plan to clean & oil if I can get them apart. I have gone through the seed hoppers & I think they're ok. Cables, gears are on deck. Thanks for any advice.