I’m looking for the following step studs about an inch long (stud adapters).

The material would be steel with zinc or sst, whichever is cheapest.

¼-20 to 10-32 (qty. 50)
¼-20 to 5/16-18 (qty. 24)
¼-20 to M8 (qty. 24)
½-20 to 3/8-16 (qty 24)

Any help would be greatly appreciated.

Thanks!,