You’ll find them in Yaowarat Chinatown, just off Charoen Krung Road, about 20 meters down Phlap Phla Chai street.
It’s just a short distance from the serious street food egg noodle spot, and if you keep walking down Phlap Phla Chai for about 15 minutes you’ll hit the kua gai intersection.
Nai Mong Hoy Tod (นายหมงหอยทอด) is a shophouse style restaurant, and you can choose to either sit inside, or open air on the sidewalk.