I have heard the same thing about using an Audi fuel pump. It is slightly more complicated than the gixxer one, but it can be one if you have to.
I found my old posts on the Strom site. The pumps at the time that were swappable with the Strom were the 2006 GSXR600 and 750 fuel pumps. I'm sure that there are other ones out there, but those are the ones that were the hot candidates back then. I can promise you that the 750 one fits because that is what has been on my Strom for the past 40k miles and it's still going strong.
I found my old posts on the Strom site. The pumps at the time that were swappable with the Strom were the 2006 GSXR600 and 750 fuel pumps. I'm sure that there are other ones out there, but those are the ones that were the hot candidates back then. I can promise you that the 750 one fits because that is what has been on my Strom for the past 40k miles and it's still going strong.