I had lost one bolt during a fork oil change, and thought I had to replace the pair. After buying two, I found one, so now I have a spare pair left. One is NOS New in the bag, the other is used, but excellent condition, threads look perfect. They also include the rubber "O" rings.
Suzuki Chart says it also fits GT550, GT750.
Price is for both, if you want to buy just one, email me.