Nos brake caliper identification

[kyle340]

Hey guys, going through some nos stuff I picked up and found a nos caliper I need help with. The box says adapter package # 4049673, the caliper has # 3880765. Came with a new piston for the caliper. My thought was it's 73+ a-body. Any help would be appreciated.

 

[68 bee]

I removed one with that casting number from my 74 Valiant

 

[kyle340]

Thanks, I had a feeling it might be a-body.