Big block oil pump o-ring sizes?

I use a standard volume Melling oil pump with an Indy cover. Does anyone know the exact size of the small and large o-ring for the cover? What about the size for the 3rd o-ring that is on the oil pump housing snout? I'd like to replace all 3 while it is apart.

when i needed them, i just went to the hardware store. mancini has them too.

I can compare them at a hardware store, just thought it might be easier to know a number or size, since they tend to have different thicknesses and widths.