Rear Drum Brake Help

Darter6 said

Rock Auto Part # FHH 7037 9'' drum brake hardware kit
They have several brands kits this is the first on the list.

Click to expand...

That particular part says it fits Valiants from '65-'68... I wonder why they think it won't fit '63? Could it be the 5x4 bolt pattern? What else changed? Especially since it fit's a '63 dart.. Tempted to try anyway.