What kind of brake calipers on my ‘71 Duster 340?

Can someone help me identify what brake calipers are on my ‘71 Duster 340? I’m new to mopars and the NAPA clerk said I should have a 4 piston calipers. The the calipers sure don’t look like 4 piston calipers. I need to identify them so I can replace them. The car was sitting for several years. Any help will be appreciated.1E6E4A7F-4A73-4A34-A83C-0F2E091CC13B.jpeg6B449EA2-0C23-46C2-A0FF-8A313F395935.jpegA0C316FA-D4E1-4EBF-A770-2985DD863365.jpeg