Just saw this thread.
Sorry you had so much trouble sourcing a flasher.
When I converted my S2 to LED taillights and turn signals, I sourced the flashers from SuperbrightLED.
I think these are the same as the ones you obtained.
Thanks for the reply Gary. I use superbright quite a bit, but they didn't have a 4-pin relay. They had a 3- and 5- version, but said they were thinking about offering a 4-pin unit sometime in the future. I think the 3-pin unit you sent the link for is made by the same company in Malta.