Wrong size steering armsfor modified '65 Barracuda

Good afternoon,
On my '65 Barracuda, it is time to replace my steering arms/ lower ball joints.
Unfortunately the ones I purchased for a '65 are similar shape but are too small. Those on the car are 10" long, the wrong ones are 9".
I believe the front end was beefed up a bit. The discs are 11".
Can someone suggest what year car might have a larger arm, so I have a good chance of ordering the right part this time?
Thank you FABO
RJG