Tires for a BikeE

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First time ever posting, so hope I'm asking this in the right place.

I have a BikeE which needs new tires. They say Primo Comet, 37-349 (16-1 3/8) front, and 37-451 (20-1 3/8) rear, and the wheels are SunRims M14A. Can anyone suggest a place to buy these tires or recommend a same-size alternative?
Thank you.
Gary Smith

http://stores.channeladvisor.com/ebikestop/Tires/

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