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They look like axial tantalum capacitors, I'm surprised that there are no part markings visible though.
Axial tantalum capacitors in that package have the + terminal on the beveled end.Usually, that package is yellow.0.4 inch between hole centers is possible for a low-valued unit: the data sheet below includes units with 0.260 inch body.https://www.mouser.com/datasheet/2/447/KEM_T2039_T322_AXIAL_T323-3316824.pdf