I'm trying to work a trade for a '79 (production date 12/78) front axle. Everything I have found shows 1/79 as the date the knuckles changed to the larger one, so I need the dimensions to make sure I'm looking at the right one. Can someone measure the a post '79 steering arm where it bolts to the knuckle for me. I've got a '78 so I;m good with those measurements Thanks!!!!