JD8181, easy job. Here is what you need.
The bearings are standard wheel bearings.
Best = A good auto parts store will carry them. Just ask for Timken set 2 and you will get one complete bearing. You will need 2 bearings per spindle.
Amazon =
http://www.amazon.com/dp/B000BZ52DO/...l_738blrckpz_b
I've used these with good luck so far...cause I'm cheap.
http://www.ebay.com/itm/Pack-of-10-T...1UP1Vd&vxp=mtr
The seals.
I've used these for years and have had no issues.
http://www.ebay.com/itm/6PK-CUB-CADE...item416d8b0f1e