New electric services for duplex.

Hoping somebody can help me out here.

My family owns a duplex (rental property) that has two old 60 amp. fuseboxes that feed each unit.

I was planning on replacing these with 100 amp. breaker boxes , and a new double meter base, however the supplier that I bought these from gave me only 100 amp. entrance cable.

Shouldn't the cable from the weatherhead to the meter base be 200 amp. entrance cable? And 100 amp. from each meter to each panel?

Thanks, Jimmerz