need advise bolt removable

Two approaches if the other suggestions don't work. 1. Weld a bolt into the top of the threads & remove with a wrench. 2. Fill in and re-tap the hole.

If I'm not re-using factory bolts, I always use US sourced hardware in Grade 5 unless a Grade 8 fastener is specified. I've had real problems in the past with Chinese sourced fasteners. They put the markings on the head but do not back it up with the product on the thread. Steel is frequently very porous.