Was wanting to swap over everything atached to the 620 dogbone. King pins, hub, bearing, brakes. I know the wheel cylinders are metric and would need adapters. I have a pair from a 72 620 and it would be for my 71 521. Just wanting to know if the 620 dogbones would bolt into the 521 upper and lower control arms. Or if the 620 upper and lowers will bolt onto the 521 frame so I wouldnt have to deal with the lower fluction pins. Ive ordered that ebay kit from Singapore and they came with rust on them that was more than just surface rust.