IH Farmall 656 gas/ IH 240 Utility/ 2, Super C Farmalls/ 2, Farmall A's/ Farmall BN/McCormick-Deering OS-6/McCormick-Deering O-4/ '36 Farmall F-12/ 480 Case hoe. '65 Ford 2000 3 cyl., 4 spd. w/3 spd Aux. Trans
New disk blades can be bought at many aftermarket places. Shoup, Tisco, etc. Just know the blade size, and gang bolt size. RWA's had both 1" and 1-1/8". Just have to figure out what you have.
John Deere still lists these pieces in their parts listing, but I'm sure pretty pricey. If you're looking for used, look in the next paragraph.
Do you know the part number for the scraper arms..?? If not best to go here John Deere Products & Services and look them up.