Was lucky to get hold of the real thing. Genuine Suzuki mirror with the S-mark.

The threads were wrong, 10mm, but should be 8mm. I made adapters in brass using my lathe, and thereafter they were nickel plated and mounted on the bike.

8mm outside and 10mm ( fine pitch) internally.

8mm

Nickel plated, still using my 13 years old nickel bath.