Diplomat parts on an A body?
The FMJ's will work fine once you get the proper upper control arms, you have to use 73-76 lower balljoints also. I swapped the spindles and brakes off an 85 5th ave onto my 73 and they feel really good so far. Haven't been able to get the car on the road because of other issues, but the feel awesome when I'm rolling around in my front yard.